Malicious PDF — malware analysis report

Static analysis result for SHA-256 7835d8b709997bf6…

MALICIOUS

PDF

49.8 KB Created: 2020-08-06 09:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bd69490bd10134f88f571305648a5de8 SHA-1: ee4bd6bfb33dd354cb0750bb097fd6190346918b SHA-256: 7835d8b709997bf60d1039167bcff9a9fd43557d14a614b5a3ba3dd513e637a7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a lure for educational content to redirect users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed for phishing or malware distribution.

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=biology+important+questions+for+class+12+pdf In PDF document text
    • http://files.shopslothlife.com/uploads/1/3/2/6/132680813/zumaz.pdfIn PDF document text
    • http://files.hourglassdevizes.co.uk/uploads/1/3/0/7/130740221/kopixokisa-lepupokad-tupisoludub-figolud.pdfIn PDF document text
    • http://lalag.azpetscan.com/uploads/1/3/1/4/131409090/bunexopefajixe_pidojemil_subuguzewedamo.pdfIn PDF document text
    • http://files.minnesotadivingacademy.com/uploads/1/3/1/3/131383586/9280685.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/1/0429/6487/7475/files/gisibesefitazapositozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6313/9733/files/2nd_grade_plural_nouns_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/gudafoxitelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4728/0026/files/63091281475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/63129652459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/98928135482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/git_move_commits_to_another_branch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/66320001978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/java_eclipse_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/dell_inspiron_1545_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/35991094521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3780/2146/files/niwubavimikemavalosiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/varogejisubekaruresum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/dozebezotobinaxujat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 5936 bytes
SHA-256: 73de5e6407540733c315765e80eddeadfe62e7a9adda0fa1f20394ca8d554a59
font_01_sfnt_off00008197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 10244 bytes
SHA-256: 40abc69b9026c2a14a52732eb59f9a4fc692aa487655bfa049dc4ab404f8759e
font_02_sfnt_off0000a4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AF 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e