Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f8b66577e1d0b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-24 21:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f62a6283f19a03842eed75c68de1578e SHA-1: fe833f1aa0d4247cab308d0daceed5446ccee0b9 SHA-256: 850f8b66577e1d0b3fe31ce4166ed143c66fc56792923c95f6363f8e00dbc0e6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to a redirector service (ttraff.com) identified as malicious. The document body, though heavily obfuscated, includes the same malicious URL, suggesting an attempt to trick users into visiting a site that likely hosts phishing content or malware. The presence of a link farm heuristic further supports the malicious intent of distributing links.

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=analgesicos+nao+opioides+pdf In PDF document text
    • http://kipilu.goldencoastbailbonds.com/uploads/1/3/2/7/132712237/valojamivaxoxi-puxenox-mikunifupekuk-luvumag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/speaking_activities_elementary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/22602138586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0812/9185/files/broken_seether_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5529/2322/files/joxikalezubosojokelevediz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/gary_moore_parisiene_walkways.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/nezotikejobotuzibuban.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/14275518075.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 4

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 4924 bytes
SHA-256: 14360635e47816de75927c77bf74c867361b1064cbec1975b4b8ed8a5ec7cfc2
font_01_sfnt_off000069b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B4 10720 bytes
SHA-256: 44ef351c40662722eabcf340c6c5712617f21bebbc11f57bc9643eae5e7a2144
font_02_sfnt_off00008d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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