Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3476a495e6e5655…

MALICIOUS

PDF

41.5 KB Created: 2020-08-13 09:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07872ac560cbf3f0750953e84e330758 SHA-1: a8a0aca1709e8cc668adee9ce1327075c2464972 SHA-256: b3476a495e6e565583647b5b352e318c54bd6646f9487d3984802b18ab8d92f2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'definition of employee relations pdf' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure.

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://ttraff.com/wb?keyword=definition%20of%20employee%20relations%20pdf
    • http://files.jenniferlaughran.com/uploads/1/3/0/8/130874284/dad8b2fb6c9bf9.pdf
    • http://files.livinginskokie.com/uploads/1/3/1/0/131070597/zebaga.pdf
    • http://tebebamaw.anextrabodymovers.com/uploads/1/3/1/3/131398453/4b5fd45e0632487.pdf
    • http://files.gettinoutdoorsradio.com/uploads/1/3/0/7/130776265/2914750.pdf
    • http://files.walkerorchestra.com/uploads/1/3/0/7/130775346/f1e5d623fb9.pdf
    • https://cdn.shopify.com/s/files/1/0448/0755/3184/files/inorganic_chemistry_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/58898452978.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/63488678385.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/1st_puc_biology_important_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/larivikoguwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6572/files/curriculum_development_in_language_teaching_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/accounts_payable_interview_questions_in.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/quiz_ice_cream_3-_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8508/files/zujazinij.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/fundamentals_of_bacterial_plant_pathology.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/78425015058.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/king_arthur_story_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/85647085290.pdf
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/73699886171.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000647b.bin
1837c39d66f4c0cb516ddf187e811d535162c89b733459879dc79ca441955983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5288 bytes
font_01_sfnt_off00007664.bin
201594758ef9f404a978b3538f5ffacb8ba105533d5b907ab8633556dff58b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 10092 bytes

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