Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fbd41a780a869a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-11 15:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9fd0c80e6bbed3dc146805d5fe213033 SHA-1: 4ea8364b4046acdd9dce79123622f7ccbda22388 SHA-256: 81fbd41a780a869a88f5b4817cca5546867708efc9da2a0c9776e15f52a53c82
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as a malicious redirector and SEO link farm. The document body, though obfuscated, contains URLs that point to a known malicious redirector, indicating an attempt to phish users or lead them to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=email+etiquette+in+the+workplace+pdf In PDF document text
    • http://files.guitarsam.com/uploads/1/3/1/4/131452804/4155559.pdfIn PDF document text
    • http://wesobiwi.musicatozpodcast.com/uploads/1/3/1/4/131453541/bisojudiduvu.pdfIn PDF document text
    • http://files.d7motorsports.com/uploads/1/3/0/9/130969357/sagepuluwerewu.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/1/0434/7818/8198/files/sasidisuxekafawugubanar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/90072602432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/42948420749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/90131014676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/94808161437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0598/2366/files/mevaposijozoluxezelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/wesilufimonafuxofiruxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/vopemajebuwigolak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/voduzebomewunewimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/pisiliwajumefenufapado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/45583648064.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_off00006be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 5456 bytes
SHA-256: ef3ca3101503e8b1c174fb5a96fff6a80b0dd038e83bedca1c4ddfc23f8a92ba
font_01_sfnt_off00007e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E57 10308 bytes
SHA-256: 0059661a22c044e22b97d5ddddbd10b750bd06aa40692882dedd92a1e3e3d1b1

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