Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d796d810ac3d8…

MALICIOUS

PDF

37.3 KB Created: 2020-08-18 23:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3ff4d32d57742c84d20a6a971c77b1dd SHA-1: 9a5536bc97534837142232e212ee5309cf0f022a SHA-256: c13d796d810ac3d8111cd624022c981bebed52509aaf96b115c2928391771d69
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a redirector link to 'https://ttraff.cc/pify?keyword=ordinal+numbers+sheet+year+1'. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or credential harvesting. The presence of a large number of external links, many pointing to Shopify domains, indicates a link farm strategy to obscure the malicious redirector. No scripts were extracted, and the document body is heavily obfuscated, limiting further analysis of the exact payload.

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.cc/pify?keyword=ordinal+numbers+sheet+year+1 In PDF document text
    • http://files.lizmazurphotography.com/uploads/1/3/0/7/130775953/5775478.pdfIn PDF document text
    • http://files.narsa-us.com/uploads/1/3/1/4/131437504/9054355.pdfIn PDF document text
    • http://waxuzot.townsquareplayers.org/uploads/1/3/0/9/130969060/mijupop_dufilumogenave_bapikebuvojazof.pdfIn PDF document text
    • http://nawigi.tagst.net/uploads/1/3/0/8/130874247/5283249.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/1/0434/2887/2359/files/pdf_to_word_converter_free_download_full_version_filehippo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5251/4979/files/effective_public_relations_9th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/sanixeriniwowugerigewuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9345/9093/files/63945022347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/kiefer_sutherland_ellie_liz_brillon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38140624907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/digital_marketing_basic_concepts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4463/3756/files/21098063719.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 3

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_off0000549b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x549B 5388 bytes
SHA-256: 23487414153587367777d1ff630b6b7fb3097d49f68271837f3f6d2dd8b69ef4
font_01_sfnt_off000066c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C4 9980 bytes
SHA-256: f5b7a685ca0809eebe1e2c2793ad9bad4bdfc13e0b4e0c0f470beeae9ca5fdbd

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