Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13f504f817377f2…

MALICIOUS

PDF

35.2 KB Created: 2020-09-12 01:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 79c16e8eca6c20d13d925a704e53c43c SHA-1: 1a17b0f1d4d3d24c2e27273c3c8a8ffc0cf68c35 SHA-256: c13f504f817377f204e87cfb4aade894df5e78023b1f392b96a91057db3c7e27
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded links, with one critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for song downloads, directing the user to 'https://ttraff.club/wix?keyword=majnu+old+naa+songs+free'. This URL is flagged as malicious. The file also contains a link farm of other PDFs hosted on static.usrfiles.com, which are likely part of a SEO poisoning or link distribution scheme.

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.club/wix?keyword=majnu+old+naa+songs+free In PDF document text
    • http://bifegofet.fitnessnco.com/uploads/1/3/0/9/130969192/9492520.pdfIn PDF document text
    • http://tagazob.lifestarbrokerage.com/uploads/1/3/1/4/131438464/8937969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/269bb8_856049e2de484f11a7ed95f703728aec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3c2e2e_a09db45ba3264d05bf169283bc16a808.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a7074a_c273d32275544c88a26cbf185a6a6fa7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6433/6290/files/barracuda_load_balancer_340_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/dibujos_para_colorear_de_barbie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/9052/0738/files/95137291006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/5237/8784/files/pexetez.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/93c935_528e979cb51f461db5b00b009b8373f4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/91e123_240d408ce5a44f71b7470c076dcb5ac5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/866690_46303f7b29304ab8804e31a51f07b66a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d8966e_d6b9dbd913154346a8e4f5171a31137c.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 7

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_off00004810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4810 5156 bytes
SHA-256: 077f4c5342002b01f5e2f7c60fdb76a7c81552ca921c272e7948048b1ab4f12a
font_01_sfnt_off000059bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 12136 bytes
SHA-256: 5ac202e9b56f0ea867b1c3ba04347951f3cf2c31847655ec6c510cb6a8329953

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