Malicious PDF — malware analysis report

Static analysis result for SHA-256 0331d61b5481ad4a…

MALICIOUS

PDF

77.6 KB Created: 2020-07-28 19:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c71beaee4fe2db957630e96c07637bbb SHA-1: d5e716e81e8d3df74f6fd65ae49664d9f08c4e4d SHA-256: 0331d61b5481ad4a5fbb2a203dc7354aedd85cc9fae904decaedcdbcf808d397
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector service, which is a common tactic for phishing or malware distribution. The heuristic firings indicate the PDF is designed as a link farm, likely to obscure malicious destinations. The ML classifier also strongly suggests malicious intent.

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=michelin+guide+2019+logo In PDF document text
    • http://files.teachmrn.com/uploads/1/3/1/4/131407388/5142023.pdfIn PDF document text
    • http://files.light-sup.com/uploads/1/3/2/6/132681002/lolonegesositub.pdfIn PDF document text
    • http://files.fairlingtonfins.org/uploads/1/3/0/8/130813778/7a5f1ad.pdfIn PDF document text
    • http://files.marvinspass.com/uploads/1/3/1/0/131069824/5139563.pdfIn PDF document text
    • http://files.drewgrahamart.com/uploads/1/3/1/6/131637606/milepikeromomur.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/1/0433/0687/7080/files/57379697448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/lanojagorumivanison.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/94173546242.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/jilezakuremufofadiburibom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/rinuzibirafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/bijekakibudadivetibove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/23076492019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/86396822205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/lanufudinulifopiwune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/pivajerijibuwibigifipa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/sezososipoginevujegomozum.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_off0000b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 19284 bytes
SHA-256: 9b366f7c6ca9cc264ff92bb9b23938e1b7d21dbc4f3b17eeda2deab79c99b628
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5004 bytes
SHA-256: dd70b89c5be4f5e4e7d59d686eb12cbae2091542a8ae5d1add255be7eb4d56a0
font_02_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 11120 bytes
SHA-256: dbfa7cf9519934f42ff7b34ab9c12291e1ae40938794920c08b4d0890fd0741f

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