Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ca1fde86d4563…

MALICIOUS

PDF

53.9 KB Created: 2020-08-11 04:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2b2c2f8332d364ca8dc7d03727a4402d SHA-1: c86654503a19fa395b79a49e170d719441ed1932 SHA-256: 645ca1fde86d4563f5aa0b463d97da2ef3bedf0126303f23b1976e10028e7c9c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'water borne diseases pdf in tamil' and the malicious redirector URL, suggesting a lure for users to download potentially harmful content. The presence of numerous PDF links points to a link farm strategy, likely for SEO manipulation to distribute malicious files.

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.cc/pify?keyword=water+borne+diseases+pdf+in+tamil In PDF document text
    • http://files.memberoftwotribes.com/uploads/1/3/0/9/130969354/3149569.pdfIn PDF document text
    • http://files.ambitupstate.com/uploads/1/3/2/6/132681516/7e7bd1276f0ac.pdfIn PDF document text
    • http://files.treeoflifeph.com/uploads/1/3/0/9/130968912/c6222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/axolotl_francais.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/50774316302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/punedorulununo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84712881745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/29468335772.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/australia_political_map_blank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/cursive_writing_alphabet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/54299604977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/manual_de_dibujo_tecnico_arquitectonico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/19597001594.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_off00007f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 5340 bytes
SHA-256: 12cc1bbe66a8434a89415334ccaa60b1bc1fa2ef557cb5853e60f76715fcb1f8
font_01_sfnt_off00009140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9140 5532 bytes
SHA-256: 4c3abbe9ab2e04f876b93955a974f3f421a2ce644a8b1a874ad986731f48e2e1
font_02_sfnt_off0000a38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA38F 11008 bytes
SHA-256: f2465e8e8673add0395c373633bdc330bcc7042d65f2af86062ebc792079f782

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