Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b5551a4ec1f916…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 00:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c4e2107e9d0755cc8adfba61e6b30ee8 SHA-1: c25c01264e9a1d092cc4d2ca872460d3d7d601c4 SHA-256: 28b5551a4ec1f916da998a08214a0d6a089612d8a1a6b005f327e9e156cc3861
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for a 'biopsychosocial assessment template'. The presence of a visual download button further supports the social engineering aspect of this attack. The primary goal is to redirect the user to malicious infrastructure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=biopsychosocial+assessment+template+social+work+pdf In PDF document text
    • http://files.dubayhomeinspections.com/uploads/1/3/0/8/130815017/rotew_sutuluzupuri_durimiva.pdfIn PDF document text
    • http://files.jessicagardnerdance.com/uploads/1/3/1/4/131438142/629cc84319381.pdfIn PDF document text
    • http://xorefuder.violiningaja.com/uploads/1/3/1/3/131383544/53ff83b.pdfIn PDF document text
    • http://jorurewi.rubyeyes.com/uploads/1/3/1/3/131384401/0a2dfa8.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/1/0437/6667/7655/files/73861876080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/petavolabegaxenegejetal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/lipabiximesat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/famulogux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/batman_arkham_knight_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/37808910563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/nepali_full_movie_kohinoor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/pigeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/81302030767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/fedadufemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7141/4167/files/xunorinomopeweped.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 7

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_off00005ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 5700 bytes
SHA-256: 0d22202d0e7faa5cac80f8b479da150da9ec028a8b7d33680228fc75a51e19ba
font_01_sfnt_off00006eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 9788 bytes
SHA-256: 3afece54ba1f63b8ca402436e6ff0cbbb97c0f5e97422502ed2f39ef182f6d47

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