Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a226214bf6450b8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 04:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ca5fe0e154d3a4b5dac651956f7a29 SHA-1: 66dc6da8d4a7fcf08caadc9a1a41dc63b3a6b40f SHA-256: 6a226214bf6450b8e072e3b34e087c00b747d97924d7f9fea5f6adfb0addc9f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users with the promise of a free PDF, leading them to a redirector that likely serves further malicious content.

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=bodyweight+strength+training+anatomy+pdf+free
    • http://files.mrclarkspe.com/uploads/1/3/1/3/131380773/2408992.pdf
    • http://jerez.faithbasedcounselling.com/uploads/1/3/1/4/131483337/2733843.pdf
    • http://files.clearlivingconsulting.com/uploads/1/3/0/7/130739715/4091635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/yahoo_mail_read_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/4459871901.pdf
    • https://cdn.shopify.com/s/files/1/0435/5008/1183/files/what_does_albatraoz_mean.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/book_of_vile_darkness.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/6935020702.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/35715046068.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/83960590490.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/22596397869.pdf
    • https://cdn.shopify.com/s/files/1/0450/2195/4206/files/black_inventions_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/8262/8766/files/gitewezuzebalujumipimop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/13172201526.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/raxarezagevipe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/vosoxomarow.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/dagufatunoxijinixunabeje.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_off00006b14.bin
2dc49ff14e60b368fd2e57e8426c33b35af9f3f400671ed03bb5aacd241b8b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 5664 bytes
font_01_sfnt_off00007e4f.bin
b758f18f4dbfa041920242807c7688882269d35e985222b4122423c596ffc63a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4F 10024 bytes

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