Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cdc8c12890cb07…

MALICIOUS

PDF

49.3 KB Created: 2020-08-13 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 744fd661144e17abab8bc46896348142 SHA-1: 3b5fe0918842c28d9735aebe0d72eb5b2df4d8db SHA-256: 31cdc8c12890cb07dcbdb3d67b97bb31d0a0e4c590d9bb6d4d7615238ebc274f
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body and embedded links suggest a lure related to 'anti corruption act pdf' to entice users to click through to malicious sites. The presence of a large number of external PDF links also indicates a link farm strategy, likely for SEO poisoning or to distribute 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.com/wb?keyword=anti%20corruption%20act%20pdf In PDF document text
    • http://zufin.wordsplusthoughts.com/uploads/1/3/1/4/131453870/bb024a3f49254.pdfIn PDF document text
    • http://vasanuta.maineflyfishingguides.com/uploads/1/3/0/7/130739777/mezowefifebulivili.pdfIn PDF document text
    • http://files.kramerjewelers.com/uploads/1/3/0/8/130874148/2687089.pdfIn PDF document text
    • http://files.thesexminister.com/uploads/1/3/0/7/130738799/bilogoka.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/1/0428/1381/6995/files/zukiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/52389029194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/tasawuf_al_ghazali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/5795/8299/files/ccnp_labs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2104/0789/files/95829265996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/takeuchi_tb240_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7418/1534/files/92938900792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/kinipiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9009/1940/files/verizon_domain_name_service.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 6

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_off00008373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8373 4928 bytes
SHA-256: 7e26a53f5002f418988acc62ddca444e46ded25980544a89107f77d11022a4c7
font_01_sfnt_off00009442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9442 10500 bytes
SHA-256: 4aa0ba2f03db59809efccb5183b0d5bea9dcffb2bc2a1e5156549f2c644eaa84

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