Malicious PDF — malware analysis report

Static analysis result for SHA-256 166486989c129134…

MALICIOUS

PDF

46.2 KB Created: 2020-08-08 20:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b697ba2cad88e0d728b5b4287c6aafa1 SHA-1: b83341d47f2c133a433113aed44876db530fe77f SHA-256: 166486989c129134f23c421c746aa63c8727fd363eb9f2be7bee9a1b20307201
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, includes the same redirector URL and appears to be a lure for a 'quantitative research paper'. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to drive traffic to malicious sites. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded 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.com/pify?keyword=proyecto+de+investigacion+cuantitativa+pdf In PDF document text
    • http://jasenifi.thestorefrontgallery.com/uploads/1/3/1/4/131438759/madifupovugo.pdfIn PDF document text
    • http://pataf.carmenvanhaeren.com/uploads/1/3/0/8/130814328/dakusiforepud.pdfIn PDF document text
    • http://files.roseandsun.com/uploads/1/3/0/8/130814056/mejetawuxeboj.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/1/0431/1692/0996/files/15384927010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5878/1590/files/jawudabusefigijazusutepij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/dibawikezudiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/zekezivifodiralosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/xogutopafekelosumilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/mimeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/18863914292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/nodaputimuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/44731626136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/tujako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/jufopubup.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 1

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_off000072a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A8 5456 bytes
SHA-256: ba8bdbfdd6d781e5f9fdb686fb97a771a8e1c358f255e492ad12d6b94b6390ef
font_01_sfnt_off00008553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8553 11628 bytes
SHA-256: 79faf3eca22f6328ee8b2d6114169189aa9c75bda1059002e87a1937fa4bd114

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