Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28a88055a9e9da…

MALICIOUS

PDF

67.9 KB Created: 2020-08-23 01:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 211c354aea8493c29b54753edf02abbe SHA-1: 3b1332bbe1e7b60a807c22908c8cb5f13b234fbb SHA-256: 5f28a88055a9e9dae62064e42a754e13af213023c7bd8e68a0b23397315f7c60
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, pointing to a phishing or malware distribution attempt. The embedded content, though obfuscated, includes a URL to a redirector service, which is a common tactic for delivering malicious payloads or leading users to phishing sites. The ML classifier strongly supports the malicious verdict.

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=barlow+semi+condensed+font In PDF document text
    • http://kaxavu.rewritingourstories.com/uploads/1/3/2/8/132814930/cd54d7d119.pdfIn PDF document text
    • http://wimaxer.oceantreeyogastudio.com/uploads/1/3/1/6/131606629/muvisolenebi-dawavemovati-warododugukiji.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/1/0432/1512/6692/files/7582476529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/jiruruzufibuzejaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/velilisaravitosegotoxeted.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5084/1750/files/xuripisudixomulofazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/vogiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/tesedojawonivikipora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/viduvukuzarogotomukub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/analogical_reasoning_in_islamic_jurisprudence.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BD 3120 bytes
SHA-256: 750d1396ea0bf5fbbfb1efa7800930e25a2e400cebbc542b316d66b1e2c172b3
font_01_sfnt_off000092f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F2 5308 bytes
SHA-256: ac3eaccffe1a01ad7b991103a89d87a2c9ceb5cc977902605b386a1b628905c6
font_02_sfnt_off0000a4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F5 24480 bytes
SHA-256: 17544b7159bc33603ef45ddac21c2ec4ad4f478b9246ec0c535762f85792b397
font_03_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 16644 bytes
SHA-256: c02e2f53e07ea5600b61f54464d1c29514763488547fd14cbde3df62446f9e0f

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