Malicious PDF — malware analysis report

Static analysis result for SHA-256 13943ed338076f85…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 15:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 957df618d8d930a4d9c0d9c93f22aa72 SHA-1: 0117dad21655c04261df6d47f1fba0e0b5fd49c3 SHA-256: 13943ed338076f852b5503c6c7ffaf80ca7dbc57cc456bcb2bd0efff6eb987eb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to a 'bible study guide' and a URL that aligns with the redirector findings. The presence of numerous external PDF links suggests a link farm or SEO abuse tactic to distribute malicious content.

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=bible+study+guide+for+young+couples In PDF document text
    • http://files.thebridgeriohondo.org/uploads/1/3/1/3/131379792/sosajigafi.pdfIn PDF document text
    • http://duvunoxum.jetvideoonline.com/uploads/1/3/0/8/130814328/mimabitigugokes_jefomexos.pdfIn PDF document text
    • http://luxosuti.piratewalks.org/uploads/1/3/1/8/131856158/funefifo_kosibezenafapon.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/1/0430/1094/9273/files/jemeleladusaxuvutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/vonufozutunonatudesipizes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/13810444594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/12377014130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/rubegifavifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/2413589107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/66598349427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/50538934718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/3435623576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/437899693.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 2

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_off00005d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D99 5404 bytes
SHA-256: e81457d1a3664d48e958cdf15995875a6b7693f53d7c09e4bbd021c1bac27fa8
font_01_sfnt_off00007009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 10352 bytes
SHA-256: b56e669125bc2fcb5adeef1811ff88e5530902d1c01d58f688a118467d615e03

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