Malicious PDF — malware analysis report

Static analysis result for SHA-256 81287c132b206362…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 06:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3a1f4b64cdac8fcfd429b0f457b6ee19 SHA-1: 35941ced061bb89d7bb1525ed9183374f3935161 SHA-256: 81287c132b20636268e3d6d36b84d2196b45e6d23a36659d907cb0b145e45354
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body text, though partially corrupted, includes the phrase 'Act irregularity report form' and a URL that appears to be a lure. The presence of multiple external PDF links, including those hosted on Shopify, suggests an attempt to create a link farm or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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=act+irregularity+report+form In PDF document text
    • http://maginan.rogeraldridge.com/uploads/1/3/0/7/130739994/xapop.pdfIn PDF document text
    • http://files.oakhillsoregon.com/uploads/1/3/1/3/131378942/5083474.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/1/0430/8933/0325/files/29190646378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3531/1784/files/visibimogusivusukozij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/degogusepoluje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/artificer_apprentice_question_paper_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/99957528079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/9276061534.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5923/1385/files/interpretacion_de_una_biometria_hematica_completa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/26855828136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6239/2992/files/71612543654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/73207288682.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: didistutter.org 4 samples

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_off00005a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7B 5248 bytes
SHA-256: e9131eea7d700b47f123a79b6ff6f1e47afc0b234855e7d91367d8a68e741eae
font_01_sfnt_off00006c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 10328 bytes
SHA-256: a9219bac6c8245a8ab5ac8309b50e59d18eda5c7dafaaa24d2cdad0e23c7cc8c

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