Malicious PDF — malware analysis report

Static analysis result for SHA-256 137cb5fd159f8eb5…

MALICIOUS

PDF

39.8 KB Created: 2020-08-22 00:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6f52d8f63bc198e2d2f7f239bf93ab02 SHA-1: 1ce6427038084525476befb952a888d8bf447be8 SHA-256: 137cb5fd159f8eb5bafeaf20ed004ac457c52e9b73427bd491eb3b2c691dbb45
194 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 a redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of a phishing lure for 'cotton sheet sets'. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm designed for SEO manipulation.

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.com/pify?keyword=cotton+sheet+sets+at+walmart In PDF document text
    • http://rifowonut.lakeeriecommunications.org/uploads/1/3/2/3/132302780/lunizibetilusis.pdfIn PDF document text
    • http://nileni.skiingisbelieving.org/uploads/1/3/1/4/131438379/f90573.pdfIn PDF document text
    • http://movelosem.bntarms.com/uploads/1/3/0/8/130814058/fixuzivu.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/1/0431/2370/3969/files/58920815698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7784/2597/files/wosusigivuxekekenodedijus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/vajejes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/0808/3356/files/cod_fishing_reports_massachusetts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/50048827170.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/binary_division_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/how_to_play_mp4_on_windows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3236/3687/files/jijenafalebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3886/7607/files/accountant_cv_sample.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

Related samples 6

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_off00005e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E22 4924 bytes
SHA-256: 3eccdc877f47d00f91e47eb839f6d3bf492695187ae9b6e3222568c304ffc967
font_01_sfnt_off00006ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC2 10616 bytes
SHA-256: 1210881add13b9cf4ba2f2adde6da04ada5f8eb3912239a670c0bc9dccfa822f

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