Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83922a9de5386d8…

MALICIOUS

PDF

47.4 KB Created: 2020-07-31 15:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 22c5dd70eb57266f804cace2e1dcea2f SHA-1: abf6e073727d63c17d62f1006b8296f9b3cb5509 SHA-256: c83922a9de5386d8a20da8f6781a59a0c20e91b0cbeb6716c382f929510fea45
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free bilingual book download. The ML classifier strongly indicated maliciousness. The primary IOC is the redirector URL, which leads to further 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.ru/pify?keyword=livre+bilingue+anglais+fran%25C3%25A7ais+pdf+gratuit In PDF document text
    • http://files.missdavisluellalions.com/uploads/1/3/1/6/131636990/2077ff.pdfIn PDF document text
    • http://files.audiocognoscenti.com/uploads/1/3/1/1/131163540/1408628.pdfIn PDF document text
    • http://files.thefreshproduce.net/uploads/1/3/1/6/131606408/zupusowekujivivofuma.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/1/0431/4923/0237/files/76329891994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/jetafijipebiturewaniwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/89590618051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/vifosugoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/50476523901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1926/2357/files/44040513932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/wopotavodadofela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/dusaxuzili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9164/files/3105276772.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/fanowuvopafifojuvo.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 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_off000075fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 5304 bytes
SHA-256: 5dc611dfef09bd35e2c530839251d607ff2eb4c4b8f9a7840e7a9e2a4dae9988
font_01_sfnt_off0000880e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 12028 bytes
SHA-256: 641cf08355456eaa4d72070f1d4a9982032794c1fc74f524e475d27061778d94

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