Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fe792bee2b2bad…

MALICIOUS

PDF

32.8 KB Created: 2020-08-15 16:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e503bc2971b307938995351e7c805aa SHA-1: 4d0e6a549123d2424d49b930b42bc5c4359734b2 SHA-256: 91fe792bee2b2badb5cc1a7b8dad6bb404165f772c797ed6b754c6b98c798c3e
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary link directing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely designed to manipulate search engine rankings or distribute malicious content. The document body itself is heavily obfuscated and contains a URL that appears to be part of the link farm.

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=ugandan+gospel+songs+2018 In PDF document text
    • http://files.amberbellemusic.us/uploads/1/3/0/8/130873944/sakoninan.pdfIn PDF document text
    • http://bexijadu.sundancecrs.com/uploads/1/3/1/1/131164250/9740916.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/1/0431/2920/8986/files/14648796319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/42652309454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/pavonup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/automatic_machine_learning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/skills_practice_scientific_notation_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7798/3651/files/70460175003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/8182654477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/wadutadig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/64108465544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/jifitesazunowar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/4089563692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/bokovokavupazasupinuza.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 2

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_off000045a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45A4 5544 bytes
SHA-256: dddad3aeaff40a00ed240b79c3f879a45e7da386acfd0662711ef1db8ffe1f5f
font_01_sfnt_off00005895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5895 8804 bytes
SHA-256: 6bc6e47a1d766ddaa18b0ef14bbd1fde428dd94fd2547212b98a9b1592a37917

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