Malicious PDF — malware analysis report

Static analysis result for SHA-256 682fcf40c1476407…

MALICIOUS

PDF

33.1 KB Created: 2020-08-09 08:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 40ab1d2aac9a4afc03d528955436e18f SHA-1: 713e9a78c13bfb07b726dc6620b074ee4f6335d7 SHA-256: 682fcf40c147640766c8908675d4690ed7caf9875e627fea6c3b30f8c04cb298
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for a worksheet. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content widely.

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/pify?keyword=capitalization+of+proper+nouns+worksheet+pdf In PDF document text
    • http://files.nkfanexperience.com/uploads/1/3/2/7/132710601/6209072.pdfIn PDF document text
    • http://files.okmerica.com/uploads/1/3/1/4/131437139/a101611bd37e43a.pdfIn PDF document text
    • http://files.wordsoundguide.com/uploads/1/3/0/7/130776809/rutifinuzepewe-juwogofo.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/1/0441/0929/9864/files/yesu_asante_sana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/suveni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/43189278788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/robujoluromixofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/30565050945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/70043037447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8993/6025/files/34998514542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/tepojoduzijelaxef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/old_king_s_great_hammer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/f5_on_mac.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 3

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_off00004418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4418 5240 bytes
SHA-256: 20796054547e4a583efc8a17b369949178fc98f97beedeeb7a0ce6e7ebcbcd5e
font_01_sfnt_off000055fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FA 9792 bytes
SHA-256: 65eb8992437f7fadbaa1b429c6396d0abe81176247fb565190ff2f14497ec86d

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