Malicious PDF — malware analysis report

Static analysis result for SHA-256 042c35fd928d87ab…

MALICIOUS

PDF

35.0 KB Created: 2020-08-16 12:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89ac11ba0158b0ec7139001df09160f0 SHA-1: f4286291a9baed25ed391ef2e9d6e3b376603569 SHA-256: 042c35fd928d87ab809a939b92a5e939c20be898598cc273e743822374b2456f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=handwriting+alphabet+worksheets+for+kindergarten`, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the lure. The ML classifier also 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://ttraff.cc/pify?keyword=handwriting+alphabet+worksheets+for+kindergarten
    • http://files.kristygloverportfolio.com/uploads/1/3/2/6/132696325/wubemateriwugef_fufiguxim_bakurekaxumivav_pufatisivu.pdf
    • http://files.iancarlsen.com/uploads/1/3/1/4/131454556/xedutikelo.pdf
    • http://files.artisticreteleesburg.com/uploads/1/3/1/4/131437421/317c33acc6b3065.pdf
    • http://files.jameskallembach.com/uploads/1/3/0/9/130969548/bigat.pdf
    • http://files.adamcoutts.com/uploads/1/3/1/4/131452988/sovodarut-zemosapimate-kiredabusil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/41843995834.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/jabeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/5005907618.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/64737131520.pdf
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/basic_unix_commands_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9114/9471/files/kadiselexukogepukevunowo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/rozumekudefogupabegoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/lunazatoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/edogawa_ranpo.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_off0000490b.bin
352989ffc0e83e619cc1c60732b05b08fcebfc32f8920f0933ec46a3c634b804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x490B 5560 bytes
font_01_sfnt_off00005bf2.bin
56ad1f4939de7e880c2fd045f5fa99b64f0c7c7684e16208292c03222ae5e8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF2 10312 bytes

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