Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae721ef0ca9a90a…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 16:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6dc188880368bd80f54e65ce9e000bd3 SHA-1: e3268d564691c9b22267f5f4199ebb92b3ec2371 SHA-256: cae721ef0ca9a90a79be5115d21087e832a43393332f2de4402dd0f4b9ead64e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, identified as a link farm, designed to redirect users to external sites. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to drive traffic to this malicious domain, likely for subsequent payload delivery.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=tower+of+hanoi+time+complexity+pdf In PDF document text
    • http://files.bitsnpieces.ca/uploads/1/3/1/6/131606493/1988115.pdfIn PDF document text
    • http://files.thebestclassatirving.org/uploads/1/3/0/9/130969211/monebozi_tewawaw.pdfIn PDF document text
    • http://files.amkcomics.com/uploads/1/3/1/6/131606284/3410681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/mevukerobak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/lijimexufegibituzevanilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/86833153279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/gugenupasud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8982/5687/files/j_cole_wet_dreamz_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/mupewabasiwetemoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/compressed_air_system_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/cardiovascular_system_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/fujojimiduwopigokibiwegu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
🗂 Part of campaign: bitsnpieces.ca 5 samples

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 5428 bytes
SHA-256: c5eb1fd97d475dca77f3a92754241e1c1c6e5cddf3e69f9004f9fdcfb12b2f1c
font_01_sfnt_off00007334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7334 10060 bytes
SHA-256: 5b7ba7e44d11bad946c41013208abd51fe3e79188bd7823f67f5202592ca4353

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