Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a18d96060e56d8a…

MALICIOUS

PDF

40.0 KB Created: 2020-10-27 09:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 77704050bd6bd5d8e809834028ef581f SHA-1: 1dd8720eb08bdde1e35076c524a1a482d29ac0e6 SHA-256: 3a18d96060e56d8a9bb22d095442f2a55de30c5c5f329c0905cd071bf4214534
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to external PDFs hosted on disposable domains, a technique often used for SEO manipulation or to distribute malware. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded links suggest a malicious workflow designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=rca+galileo+pro+11.5+32gb+tablet+manual In PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/1e35e.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/1563960.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/16b44.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/vozebovin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f91dce335240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f8e9df2442ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f8ff4473a2eb.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/3321595.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/c28273254.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/kitilivawawetojir.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/dilujekup.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/rimel-pikodanujew.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/8092127.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/8891762.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/belapigojat.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/voninajekagefumazis.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/2e53fdf61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a50822-96d8-4c12-ba48-35fc4de9cb38/mamixigatibunesikivoxag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cf6c2c-32f2-4efc-a7ed-456ca324b251/xamexoxofagugiranin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b51602-78a7-48d7-a6db-6ee942284df2/57450115649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec8adb6-e21b-48a3-a4d5-3d39a912591b/34926138043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db71f461-e911-43d1-8487-886854c93bf4/tsuki_adventure_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8345/7197/files/tabelle_assegni_familiari_2020_inps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4829/4807/files/37557804665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5631/4521/files/waldorf_education_a_family_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1214/4283/files/area_of_triangles_and_quadrilaterals_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF7 5724 bytes
SHA-256: 71d48af3a6bbd546658c0d465798b961fd1cf456839fea2a962972e1ea320871
font_01_sfnt_off00006e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E64 10760 bytes
SHA-256: d52e12105cc9f5c21daaaaf3871f37b1b8aa4877205b49625fa0c329b49019d0

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