Malicious PDF — malware analysis report

Static analysis result for SHA-256 81561d724f48b0f3…

MALICIOUS

PDF

42.5 KB Created: 2020-08-16 12:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2c444a72544c265c2cbdf98d17b8a3b3 SHA-1: e17d4be65c2020f8e3db543b82730f8a7bc4d932 SHA-256: 81561d724f48b0f3b973eaa1c362d3321f4ff12f8221d328d6da0ab3ba9d6999
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, which is indicative of a link farm or phishing campaign. The primary redirector URL is identified as malicious. The document body text and embedded links suggest a lure to download a PDF, likely to deliver a malicious payload or phish for information.

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/wb?keyword=how%20to%20deal%20with%20stress%20pdf In PDF document text
    • http://files.thelittleschoolproject.com/uploads/1/3/0/7/130775098/lupadakumepemux.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/1/0428/7270/1095/files/miguzajorosusirupuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/fitukeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4575/4792/files/95575644974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/7108971432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7470/6853/files/jepalawojugewojotil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/rewubawimezewufana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/movatevetitoratili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/zasukolut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/68420369212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/lizisefitelonuvulifogaxum.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_off00006a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5D 5180 bytes
SHA-256: 10e7d6ffb8da1de2eec15430795ccdc1d459509d3377f3a0ceecc75dfd24b638
font_01_sfnt_off00007c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 9828 bytes
SHA-256: 55d14b356b5502a974d339190a0c477044be8b079cc5d6869ce169b2fce99d6f

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