Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f5c15c73757e0a…

MALICIOUS

PDF

52.9 KB Created: 2020-08-12 09:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4dfa447e92648402c5102b08bb94cca9 SHA-1: 017ac7b0a778753af1f361a0005b1a3aa6370352 SHA-256: 82f5c15c73757e0a8a636123758437781a841a9ec7d4d463a916671b85d48626
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, including links to known malicious infrastructure and a large number of generated SEO links. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. This suggests the document is designed to trick users into visiting a malicious site, likely for phishing or malware distribution.

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/wb?keyword=pdf%20to%20jpg%20hq In PDF document text
    • http://files.oestore.shop/uploads/1/3/1/4/131453213/soguvigapoxod.pdfIn PDF document text
    • http://files.adrianamedinacagan.com/uploads/1/3/1/6/131607054/522351.pdfIn PDF document text
    • http://files.dcmspto.org/uploads/1/3/0/7/130739128/9199250.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/1/0435/2504/6431/files/learning_management_system_research_papers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/zopetipavolujoxusobasiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/dilurasup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/life_skills_counseling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/allons_y_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/nudejomudidoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3263/2730/files/68605688699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/gitakikotupopivejalire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/la_couture_pratique_burda_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4919/5419/files/aisc_manual_of_steel_construction.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 8

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_off00008c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 4988 bytes
SHA-256: 53d5525caa6f9b46de57847e46d4da4f33711c3407aa94db0854e27a73044ac8
font_01_sfnt_off00009d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D57 13008 bytes
SHA-256: e3ab5f58354165e88da991a7db7cd8c04723410b22f6817c349933e1550f0af7

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