Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be6a27317299250…

MALICIOUS

PDF

43.9 KB Created: 2020-08-07 03:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 283d296db09473662741241b63a0823a SHA-1: 228d433a2c444da02100259af3c06d129e060b20 SHA-256: 6be6a273172992505d4bbc5cd281a56619be87389904e6581e1ac854ab5fd992
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDFs hosted on various domains, forming a link farm. One of the primary links redirects to a known malicious domain, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links.

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.ru/pify?keyword=hipoplasia+renal+pediatria+pdf
    • http://nukifodel.roamwithray.com/uploads/1/3/2/8/132816202/907b6ed0202.pdf
    • http://files.bronzeleonleonbergers.com/uploads/1/3/2/7/132710694/6501268.pdf
    • http://files.moxyinithaca.com/uploads/1/3/1/6/131606953/3560203.pdf
    • http://files.beyondorganicsgarden.com/uploads/1/3/1/3/131383575/1fe6f2.pdf
    • http://files.wbc2018.org/uploads/1/3/0/8/130813366/4a59998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/5359471905.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/27609034311.pdf
    • https://cdn.shopify.com/s/files/1/0440/6676/7013/files/sds_holland_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/18930805668.pdf
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/85016072143.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/mushin_esoteric_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8477/files/xumarozuvimipena.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/lowabetoxoxoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/8806/7225/files/mac_mysql_reset_root_password.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/novos_anticoagulantes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5572/7260/files/60568702375.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_off00006e3c.bin
65171babffe28e49a831f0bacd3703c1f9044c26ade3511f7a4cfdff83124f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3C 4996 bytes
font_01_sfnt_off00007f43.bin
e08336aac67f95e62e6cc38d365222fe7606300e6bc9851a0a0bca86742b887e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F43 10392 bytes

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