Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cde229cd385817…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 03:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c59bc7fecbffbf9db0de4c93f0569117 SHA-1: 7faa9487834d840abb4214adabae0aa214ace145 SHA-256: 28cde229cd385817a3c426b3ef38497add1843105b8108bfd48084c14bd51ab8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to drive traffic to the malicious URL. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection 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.ru/pify?keyword=railway+ntpc+full+form+sarkari+result In PDF document text
    • http://files.dj-reaper.com/uploads/1/3/0/8/130813979/2608005.pdfIn PDF document text
    • http://files.loganelmteachers.com/uploads/1/3/1/0/131070452/milavibuba_bolanera.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/1/0441/0910/3256/files/57241969016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/webezazafibuveju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/epidermal_layers_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/vaxokolomusavadawokesega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/old_amharic_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/62330464139.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/pop_flute_sheet_music_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/93326322014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5613/0200/files/seragedaperad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/managing_brand_equity_david_aaker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/static_gk_capsules.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 5424 bytes
SHA-256: 8b924d9c23a2b66649648cf4f830d9837965bff98574835fdf3a78ab58bd14d4
font_01_sfnt_off00007a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 1936 bytes
SHA-256: a8ba320a0ac8a73a5a8cc2c47ba30bd151ec5f51af4d5ac0b9daf85eaa8f1301
font_02_sfnt_off00008360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8360 10876 bytes
SHA-256: 9d815e4c225478e0672df05093b0859d4716e8dcd14dcfd05704202bbd506e17

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