Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dddc5589df1679…

MALICIOUS

PDF

61.9 KB Created: 2020-08-12 01:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af853b4b4d0547a7f4cddf9e8e3ca93 SHA-1: 58caf42fa9c636ebab0f6835d1bb8b5fa41457e3 SHA-256: 07dddc5589df16790673452a07367471834310a876d616ead46747ad9c672c17
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict, and the presence of embedded URLs indicates an attempt to lead the user to a compromised or malicious resource.

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/pify?keyword=the+analysis+of+panel+data+under+a+markov+assumption+pdf
    • http://files.illinoisdelta.org/uploads/1/3/2/6/132681938/2186787.pdf
    • http://figaxa.gloucestershire-epc.co.uk/uploads/1/3/1/4/131454106/duriwaf.pdf
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/rewitozuzemiwikivereda.pdf
    • https://cdn.shopify.com/s/files/1/0429/2994/6787/files/imperative_board_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/vogufazuverosalufag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12247178291.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6821/files/rsync_without_encryption.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/11836402166.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/71874996120.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/agriculture_upsc_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/adventurer_s_vault.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/16369095153.pdf
    • https://cdn.shopify.com/s/files/1/0451/1626/0517/files/profile_picture_for_discord.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/15982480600.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/aitsl_standards_for_graduating_teachers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090e2.bin
35d0edf9fa49251d34f2c155c25702cfcbcde5fc2eb7ca55990c2df2c3fd0243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E2 5456 bytes
font_01_sfnt_off0000a353.bin
cc161a59148d6187bb04ef54d4eed035945049e56de72d4c8374bb5ba2752527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA353 15708 bytes
font_02_sfnt_off0000d4f2.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16092 bytes

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