Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ca06cf1a1240b9…

MALICIOUS

PDF

69.3 KB Created: 2020-08-24 11:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 429529964f12e6b532f9319cafc59d1c SHA-1: 854b99e17597e90215400d3d9655ecbac9c21594 SHA-256: 75ca06cf1a1240b90cdfaaabfcaafa74c740a41fc2f22d07c7b225539c5ec59d
154 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, ttraff.cc, which is disguised as a 'subject verb agreement worksheet'. This indicates a phishing or malware distribution attempt. The file also contains a large number of links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to obscure the malicious redirector. No scripts were extracted, but the presence of malicious links is sufficient evidence.

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=subject+verb+agreement+worksheet+with+answers
    • http://fibova.hiesladybears.com/uploads/1/3/1/4/131438437/pugabutisimated-jubisopadomaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/70380814758.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/76100928029.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/nowolik.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/13514100592.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/luxupeper.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/academic_writing_skills_3_student_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/antivirus_for_computer.pdf
    • https://cdn.shopify.com/s/files/1/0431/1043/2930/files/veletubexiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/derexonagalobofakik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/business_plan_for_restaurants.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/jewusotifijixiza.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7678/files/pileneseligo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75a.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 2828 bytes
font_01_sfnt_off0000d155.bin
7969bfdaafc2062814a2f0ced339f0fb5d6231bad77a91784c1347a75d74282e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 5716 bytes
font_02_sfnt_off0000e4b9.bin
4e67ff9de9bc6e20fa6d6cbc2ed4f5db7f65f2d7356fa1a3fe6c648b19c13545		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 10156 bytes

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