Malicious PDF — malware analysis report

Static analysis result for SHA-256 729d9a12fc2352c6…

MALICIOUS

PDF

38.5 KB Created: 2020-08-06 11:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77dc31d0fc7587d29d32de757887e8ed SHA-1: 115caedc216ae7ec89263c8a845dd5fe891af520 SHA-256: 729d9a12fc2352c64a8517e8e695b0f42f6968498ca136c3d9f8d5e318d47471
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, suggesting an attempt to manipulate search engine results or distribute content through a large number of sites. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=cambridge+english+grammar+and+vocabulary+for+first+pdf
    • http://files.infiniteaction.net/uploads/1/3/2/8/132814967/kasaliwewenepuva.pdf
    • http://files.limocleveland.org/uploads/1/3/0/9/130969430/3f8b0fb6b1b3.pdf
    • http://files.goodshepherdreading.org/uploads/1/3/1/6/131637606/tagegomo.pdf
    • http://files.oasischurchaiken.com/uploads/1/3/1/3/131398374/napojabibo_pepig_vuleno_bozagu.pdf
    • http://files.lindyjames-christenson.com/uploads/1/3/1/3/131379612/3953267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4415/0165/files/vodotefoluzepokewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/genius_training_student_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/avalon_high_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/42507486129.pdf
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/hosting_website_on_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/hack_someones_snapchat.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/gatovofowex.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/occupational_exposure_band.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/85905272610.pdf
    • https://cdn.shopify.com/s/files/1/0438/0862/0701/files/5863228771.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9406/files/revolenet.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/zukiwawuxeteniduzib.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/sinun.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/menuzatewobelomop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/us_ntp_pool.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056b2.bin
875189f20b679d4c51992898275a60dcaafdbe1e0cf25620f94e7638d9216fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56B2 5776 bytes
font_01_sfnt_off00006a3a.bin
f0779715067f52b8be4c1c4b140a459e2197ffa6b8c166c34e6818ceb4ad9e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3A 10076 bytes

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