Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf9cb451950948…

MALICIOUS

PDF

46.8 KB Created: 2020-08-06 16:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0349e8f6f6c8f249279aa14007b680c2 SHA-1: ea74fe7709f541e3e8d16194c89be0c98e403615 SHA-256: 8bcf9cb4519509481dccdd62c3ee0ee763ab61f1c4331c46556e473890ba2f91
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and references to menu PDFs, suggesting a lure. The ML classifier strongly supports maliciousness. 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.ru/pify?keyword=baobab+cafe+and+grill+menu+pdf In PDF document text
    • http://files.historyofparkinsonsdisease.com/uploads/1/3/1/3/131384098/kuxinisum-bufix-jatogusenora-wijipevaf.pdfIn PDF document text
    • http://files.miriammccormick.com/uploads/1/3/0/9/130969160/jubunadekem-denesofiritav.pdfIn PDF document text
    • http://files.lovingthestart.com/uploads/1/3/2/7/132712093/509171.pdfIn PDF document text
    • http://files.darkderby.com/uploads/1/3/1/3/131381682/pinijimudix.pdfIn PDF document text
    • http://jezeva.artbyannette.com/uploads/1/3/0/7/130776046/jeduvetozamizav-susubesowupazuk-kujoruzeloxetam.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/1/0433/3551/6318/files/tuzedubinitogabuvejamuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6971/9199/files/voluzoleporutezesef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/vocabulary_exercises_for_elementary_level.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5823/1461/files/grammar_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/tetunawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/gejazijosenoxijejakoman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/nijibibetivedibezapixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zebegevuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4923/6118/files/4765881171.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/bobufur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/26669957376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/pumekaridinojuzeropipunar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/binoluso.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 5

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_off0000779c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 5488 bytes
SHA-256: 53880d9c7289e9f6e09cc5fee9ddcb868e97e5042de45da90efe30ec30a409ac
font_01_sfnt_off00008a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 10592 bytes
SHA-256: bed92cd39d5d835b742bbacd18bb2a01890f49915e42982930c496b0cb4c0e33

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