Malicious PDF — malware analysis report

Static analysis result for SHA-256 309b2f055d2f225e…

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 23:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4eefabc22a1e3008ce00a5d38c3039be SHA-1: 98ef6a1ba8819c99643461bbf845b6c02dfaf76e SHA-256: 309b2f055d2f225e2ad1b4012ee8daae1d24f09b228b8578cb6f91e1b0309849
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm designed to direct users to external sites, including a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the identified malicious redirector, suggesting the primary purpose is to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=best+manual+height+adjustable+desk In PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/4246696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f8dbfc14c73d.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/sixukejomiwewanage.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/d6c255ac4c03.pdfIn PDF document text
    • https://sumadapovememer.weebly.com/uploads/1/3/4/4/134494733/gilaviwiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f90d4ce1a7d0.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/jisewil.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/rosadifegabanajigi.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/67876562-e120-4061-982f-830ddbe35eae/43289004462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac35656-d2e9-4182-adc7-e373d0a2806a/67697867731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0aa52cf-1225-42b6-980b-05cc71d5c4ff/kujukeneribepagafiwedin.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/tawufewituwozezabexaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1f1ac1-3afa-4b19-97e8-adb28232a318/88286359492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393b9461-05bf-4ce0-98ce-8a70e2622b2a/suvovizejagikuv.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_off00006884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6884 5472 bytes
SHA-256: 76f30cfe462a3c5ee242ccfec944c93d324bc5b5ee9b9c3c1533bcc86f8dfa1e
font_01_sfnt_off00007aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 10268 bytes
SHA-256: 767d88e7dbd6d5d1d5d7121c3c3196aac3c1cfd029f4a0b7b4901ee023645cec

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