Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a88f8897e8349be…

MALICIOUS

PDF

56.6 KB Created: 2020-10-16 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c5144a6667296c0c60b7000191e94c5 SHA-1: 68d97fe786cf371b4f2d734a1cdfc771e2a01284 SHA-256: 4a88f8897e8349be093e29653f127b391ac786d1a8bcab93aeebfd632747979c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs. One URL, 'https://cctraff.ru/123?keyword=esic+udc+general+awareness+pdf+2020', is identified as a known malicious redirector. The presence of a large number of links, many hosted on disposable domains like weebly.com, suggests an attempt to distribute malicious content or conduct phishing by overwhelming search engines or users with links.

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://cctraff.ru/123?keyword=esic+udc+general+awareness+pdf+2020 In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/gowijipomunolu_lirogub_loletakimup_rozugofekowe.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/goxovunixaliba_zilege.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/01fe15f0ea.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f87398dab675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f88c6ec66da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f88bf0bc8fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f88c6e19109f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f87b9c88161b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f875f57e9f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f88d31ecced4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f872a5461db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f87360e359f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f88ba87d3534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9331/8550/files/12847374587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5423/8369/files/bodomuzegezegefitifoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0038/5695/files/cockneys_vs_zombies_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8593794-2f2c-4cc1-978e-73ec9cfbc5c2/polewiledizivubelot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2daeb4a-ebd9-4bd4-8fb0-c073c084422e/jolapuxamufodexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6e9997-fcf8-4e08-89f1-09c2890460c5/jenamorimegudadunuvizas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f374de5c-4110-47f2-ba56-dd2675518a5f/32385495013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f222a4-cecc-431b-a09c-00a4c11fbfe9/tijomokuzorudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/8320/9373/files/jean_inman_study_guide_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2474/0252/files/dating_chat_apk_download.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_off00009da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA3 5648 bytes
SHA-256: 7e2b7a2c5b8b048dcc0d8681a154c16431ff0fe1fa149df883c243fc433fb40a
font_01_sfnt_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 10408 bytes
SHA-256: 90c32f4f2281736125c2c06f26cda2bc362c684ca3b2f0e6e316e80204829588

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