Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f65bf966df7d3b4…

MALICIOUS

PDF

111.3 KB Created: 2020-08-06 21:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f94c8a094034cba33fcc5ad28bc6b8e0 SHA-1: 3abaa9b1e8bcfe852d680565c0d48a4e2eeb7d06 SHA-256: 6f65bf966df7d3b4f5a42aefbde64b4de65ca80101621510d578690fd1eb088d
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the same URL. The presence of a password-protected archive lure suggests an attempt to bypass gateway security by encrypting a payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=anthropogenic+activities+and+their+impact+on+environment+pdf
    • http://files.thespringerstudio.com/uploads/1/3/1/4/131453539/3a1c759afa.pdf
    • http://files.fibrechick.com/uploads/1/3/2/6/132681812/gedivuzexix_zukovelotewe_zelepev.pdf
    • http://files.teamcanadabc.ca/uploads/1/3/1/8/131856185/c9d42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/mevuworobexeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/13987035884.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2904/files/alimentos_ricos_em_fibras.pdf
    • https://cdn.shopify.com/s/files/1/0440/5982/0182/files/ccny_physics_208_lab.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/types_of_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/8765/1235/files/11365186596.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/nabafizifetesug.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/69857536919.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/flash_video_downloader.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/wenerosijasuvawevunatuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/51378717526.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/46199703766.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/20812453556.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_off000177ae.bin
d86af2c51f9566b237b0344b3bce162df2d0edc89b99a36a90e52611b04534da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177AE 5584 bytes
font_01_sfnt_off00018a92.bin
29175bb3a90c8e8084c014d6d7ef4e95c7cfcd10c8c88413e6005c0e7408692f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A92 10656 bytes

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