Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c2c94c8752faf…

MALICIOUS

PDF

44.4 KB Created: 2020-08-03 23:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: df75eb40e533af7450ef994843fb7819 SHA-1: 7669f41b9a8739c0619ff1e8a83d838918399f26 SHA-256: 135c2c94c8752faf241d405bf3b2182082c69f42ba2ebec43e0d81f5823009df
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt disguised as educational material. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links, including one to a known redirector, supports this assessment. The document body, though heavily obfuscated, contains the redirector URL and other links, suggesting an attempt to drive traffic to malicious sites.

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.cc/pify?keyword=writing+numbers+in+words+worksheets+grade+3+pdf In PDF document text
    • http://files.byronwashington.org/uploads/1/3/2/7/132710763/wapabozogu-dakolaju-kokirup-tosuguwixeg.pdfIn PDF document text
    • http://files.lca-of-tc.org/uploads/1/3/0/7/130738871/1925702.pdfIn PDF document text
    • http://palotolo.wintersetumc.org/uploads/1/3/0/7/130775169/7a94ef1e3e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/ammie_grace_matalka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4528/8093/files/20786509473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/76152321876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5023/7085/files/1487038567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/mogomoziteke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/73330647229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6265/6166/files/50283034495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/jofafodoleme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/jorijagoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/prentice_hall_chemistry_laboratory_manual_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/dudixubebavubuxoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/gewelewa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F47 5780 bytes
SHA-256: 39c627d2eb9d63f53c93e0d504ae0e20dc215b2cb635ba37422c1d2ef8292a97
font_01_sfnt_off000072df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DF 10396 bytes
SHA-256: 3ad393dbae1214c2450804ea78855f27da5238673340ca72f0a05a053295b1b3
font_02_sfnt_off00009670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9670 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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