Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8950eb1082e4767…

MALICIOUS

PDF

33.7 KB Created: 2020-09-13 00:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8a6cffab93ca94d1f4e5878c91661cb6 SHA-1: 57fb44ef6b35d7835ef1a4bac80cc56ea9e5fae1 SHA-256: f8950eb1082e4767896fbac2941234bdbe99a70a41ebe913feee2f70468f9941
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'vocabulary workshop' and includes the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute the malicious payload across multiple domains. No scripts were extracted from this sample.

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.link/wix?keyword=vocabulary+workshop+level+g+unit+6+synonyms+answers In PDF document text
    • http://files.amazingpakistanis.com/uploads/1/3/0/7/130740049/0ba587349.pdfIn PDF document text
    • http://files.southgeorgiaelitecheer.com/uploads/1/3/1/8/131856124/877c02ffd52.pdfIn PDF document text
    • http://files.doncasterchoralsociety.org/uploads/1/3/1/4/131454304/8011846.pdfIn PDF document text
    • http://files.btccricket.co.uk/uploads/1/3/0/7/130740591/6101994.pdfIn PDF document text
    • http://resipulud.wildonwildlife.org/uploads/1/3/0/8/130814328/a6f555a714ba12.pdfIn PDF document text
    • http://dosagijik.truehopehealthyliving.com/uploads/1/3/1/6/131606875/gagasixuzan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_5b60b0c50f844d458b006f84c3d5d206.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bf650e_72c8420dce0b4426b4243a535348c9e5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7e6083_b126f5a96f484015af788288ec651624.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ede58b_14f6415e86f242f499825dbaff27a480.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cfc61_3023ead3b11d4e9793f6879569ca9a64.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c7a620_e88ab4890e1f43dca9b522077b9cdf4b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d4c4cf_24119f3f5e4b44c8bd90464ae92b714b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/defd8a_02796bb40e6a4d7eab9f434be2df5d2a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4538 5924 bytes
SHA-256: 67e92bac39c4360efa9a4bf60191f7c997ee1b7ec4980642a36a5d6bd313c36b
font_01_sfnt_off00005959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5959 9516 bytes
SHA-256: f8076f6a4823634006ef8a7dc397ba3fcb58610e65bfaa3222c15c83ba88135d

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