Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf6651daad463f6…

MALICIOUS

PDF

54.2 KB Created: 2020-08-21 14:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ea4865606af4399da18730f06ecfae SHA-1: f72844caba4dea22846d8a645ef35ded6edb3175 SHA-256: 6cf6651daad463f6885a0a036e59ee4edebc1f5395187cab262ed1b765ebec38
162 Risk Score

Malware Insights

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

This PDF document contains a link farm and a redirector to malicious infrastructure, masquerading as a "Ma challan form punjab university". The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to lead users to external, potentially harmful content. No scripts were extracted, but the presence of numerous links and a critical redirector heuristic points to a phishing or content-luring attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ma+challan+form+punjab+university
    • http://files.mercy.as4u.us/uploads/1/3/2/7/132740553/1697708.pdf
    • http://files.floridacoalitionalliance.org/uploads/1/3/1/6/131607310/sujinedokibakejexava.pdf
    • http://jisimoku.bsunphotography.com/uploads/1/3/1/6/131637881/maxak.pdf
    • http://files.authorrnewson.com/uploads/1/3/2/6/132695354/9707552fbe1059d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/dabixejogewajavusifapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/monemenerud.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/let_reviewer_for_bsed_major_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/artforms_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/difosubasodoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7292/7384/files/vofug.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/xosuzuzirafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/rhel_6_desktop_iso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077e1.bin
099fa4806fffd3caa5ff8a9f74d10b6b037c2b5df5586f111cf8bdaa06795057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E1 5636 bytes
font_01_sfnt_off00008af2.bin
b2a28b2881426440dfe96cb472577b64d4a2971db1e2a746fb7cb985984077a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF2 13644 bytes
font_02_sfnt_off0000b6a5.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 16164 bytes

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