Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf921054ae4a9c…

MALICIOUS

PDF

42.2 KB Created: 2020-10-29 01:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a65b30adeb206aa8d6368124e75b40e0 SHA-1: 9a6181f3b851707a422e0df3cf2939d3c8b12163 SHA-256: 6ecf921054ae4a9cfc1c754ea5a1e58f1bf592441872589182b133409091bec2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a lure for test answers, specifically for "Romeo and Juliet". The presence of numerous external links, many pointing to PDF files, suggests a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=romeo+and+juliet+final+test+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f9511f04a9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f96c52807089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f894222b2c7f.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/44efc789-5df4-4bfe-b171-58a511ec63d2/43880882306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e264569-f63e-49cd-a11f-f41e1b6be395/89183099652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9346/6517/files/72153694225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9e2e29-b546-40fa-8cdd-e4cba7d3d77f/pavubekizajomapet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801e9b0d-3638-437d-95fb-5d6c2507ec43/game_of_war_fire_age_hack_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553da959-af8d-42e5-8c09-b5207864bbe0/kufefelodabuzeromum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3432/4387/files/68157565932.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/avery_postcard_template_landscape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b984651-0fd9-4dcc-b453-fbc85a0923db/18150067394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7248/6076/files/south_park_video_game_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/tylenol_500mg_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314711c4-69f3-457e-a11b-23d79200d9fc/wilco_learning_how_to_die.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31fbb8ae-fbaa-448f-abdf-817bac6dca17/95428571439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6013/3529/files/sopatuvasoleno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/lifeshield_health_insurance_login.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_off000066db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DB 5228 bytes
SHA-256: 1da3c1b64ab0ccbcfea27267ae6f6ac0b275b46a7f488e5ad394813f899936d4
font_01_sfnt_off000078a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A6 10432 bytes
SHA-256: 5464440e831a7137caf722d844cefb45e44be12d6eccb6272957d0ae6fd879d5

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