Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d5b88c078207a…

MALICIOUS

PDF

56.0 KB Created: 2020-07-30 10:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f2312c7851ea20ece70240d178abd442 SHA-1: 110317cb6acd4fd262a36a8a71b6b96bcdbca4dd SHA-256: e81d5b88c078207a968bad6950f7d84493e8faac0cd973993751cf838e72f4e5
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Recapitulation theory pdf' and wkhtmltopdf, suggesting a lure document. The primary attack vector appears to be redirecting users to malicious sites.

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=recapitulation+theory+pdf In PDF document text
    • http://files.thetinyjungle.com/uploads/1/3/1/4/131406288/mofukexaxuwep-sazob.pdfIn PDF document text
    • http://files.conditionsforlearning.com/uploads/1/3/1/4/131482950/lufumipajoset.pdfIn PDF document text
    • http://files.richwoodsstjuderun.com/uploads/1/3/1/8/131856333/gowegubipetodo-sokule.pdfIn PDF document text
    • http://files.tuiwalk.com/uploads/1/3/1/4/131438180/nerotem_rujej_wadivatufojatu.pdfIn PDF document text
    • http://files.movewithmeg.co.uk/uploads/1/3/1/6/131636956/geluronofapufar.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/1/0429/9204/2137/files/51123223115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/17273285168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/53205416878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/23420003481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/20868323961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/60445186259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/12334504746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/fatene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68906731860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96258555683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/vorum.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: thetinyjungle.com 3 samples

Related samples 8

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_off00009e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5C 5056 bytes
SHA-256: 8d512a66630f614a5849628fb6418a414538a0f4cd3539aa854871919108f325
font_01_sfnt_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 10308 bytes
SHA-256: bedc7f2f78793cb01b239215fa9bd019faa5d45b86c2e5e16f21a4b230e9a5e7

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