Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd77d6717a9946e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-06 15:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05ed77b5ebeb6390c3e59b8224f8646a SHA-1: 26befc4302b672381e9892e2c6125703266c7c53 SHA-256: 6cd77d6717a9946e591c5af35ef1a8c913550d5ee387c713e823bf1177e0cdf2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=all+bangla+newspaper+pdf`. The document body also contains this URL and numerous other PDF links, indicating a link farm designed to drive traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click the malicious link, which is likely part of a phishing or malware distribution scheme.

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.com/pify?keyword=all+bangla+newspaper+pdf
    • http://dewosuvam.evansmstheatre.com/uploads/1/3/1/4/131411896/6bb08b00772c.pdf
    • http://files.ronsokolbooks.com/uploads/1/3/0/9/130969364/c302a8c1736f.pdf
    • http://xozipuw.petermanjewelry.com/uploads/1/3/1/8/131871699/562cb577ce.pdf
    • http://files.kyocreations.com/uploads/1/3/0/7/130775828/timezotiwebi-figetatizugel-jebimilulum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/313075025.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/93_toyota_camry_factory_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/8913/9614/files/99612205298.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/nafokibadizutidepulawije.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/miwaranav.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/zuzuliwowibox.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/rheem_furnace_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/zugirawizukeb.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/vonafonivevefipixopilet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/54313748775.pdf
    • https://cdn.shopify.com/s/files/1/0437/2509/5062/files/tunivumub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/19170511541.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_off00005c7f.bin
24aaf1fa5e78a53ac3aaa3290ece80878c1c1802dada33a4dfb55d8298000489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7F 4980 bytes
font_01_sfnt_off00006d73.bin
e8838fd157cd3eac226bda1d3fbd25bbb9976a296b4582f438e32e6fc1d37808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D73 9680 bytes
font_02_sfnt_off00008e98.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E98 4324 bytes

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