Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9f87b2412c9d78…

MALICIOUS

PDF

63.1 KB Created: 2020-08-09 23:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2ab78d173b80fa3cc83a4fc0b0ab8e41 SHA-1: 8df3b169a322bf39aab1b3353b9b0a83a394485f SHA-256: cf9f87b2412c9d787349856c550a6dc4ff4fa9ece043c03759f6679b09c5ee00
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to academic writing and includes the same malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a redirector link reinforces this assessment.

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=academic+writing+for+graduate+students+3rd+edition+answer+key+pdf In PDF document text
    • http://kuragu.breinerlawllc.com/uploads/1/3/0/8/130874431/8381042.pdfIn PDF document text
    • http://files.tenyearsonestep.com/uploads/1/3/1/3/131383934/475a0f9.pdfIn PDF document text
    • http://files.cubcountry.org/uploads/1/3/1/4/131438392/7344747.pdfIn PDF document text
    • http://files.aspervalley.com/uploads/1/3/2/3/132303312/setebamekovuxo-xejip.pdfIn PDF document text
    • http://files.zoewilsonnutrition.com/uploads/1/3/1/4/131437636/1016373.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/1/0428/8082/7558/files/28754375810.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/72297226472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/bakobifulogomosixufijodok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/bezaguwivukexan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/oliver_super_55_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/89338622087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/xirugilopumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/71211778897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9896/0026/files/monster_handbook_d_d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/java_tm_platform_se_binary_not_responding.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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 5852 bytes
SHA-256: 2b1b1d2933be6027296fd2a6527faf213663bef44409f3e2b4b773fff156edf0
font_01_sfnt_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 9880 bytes
SHA-256: 111b5640adb1568e2043659b366c54bf5ca3ecb84833fefd7da2ebb28dcedd3f

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