Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c356907659c9610…

MALICIOUS

PDF

51.9 KB Created: 2020-08-13 16:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a084fe203ef8ae436eafce655753b9 SHA-1: 1dc7bc9267d348f107cf0398a0700613d30c211f SHA-256: 5c356907659c961067610a9ac4dcc5eefb3180e4ca6403d8f641106457380b89
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to 'https://ttraff.cc/wb?keyword=ncert%20history%20class%2010%20chapter%201%20pdf'. This suggests a phishing or scam attempt, masquerading as educational material to trick users into clicking the malicious URL. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=ncert%20history%20class%2010%20chapter%201%20pdf
    • http://files.oscarstarkgolf.com/uploads/1/3/0/7/130776661/risufugunuku.pdf
    • http://files.victoriapolishhall.com/uploads/1/3/1/4/131408502/nepisogepefotadagevi.pdf
    • http://files.kokopelliu.org/uploads/1/3/1/4/131438405/783326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/az_100_exam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/talomipujoranozoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4660/7765/files/chairmanship_honor.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/44281334001.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/67675299261.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/63882807569.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/lubibazezoduka.pdf
    • https://cdn.shopify.com/s/files/1/0447/2084/9050/files/aok_ahb_antrag.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7423/files/abordagem_qualitativa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zitadeduwifugegumav.pdf
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/gefanajijawulenuwogojo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/95458083401.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cc4.bin
8c2afbda1901b3442a7d992fafaaa42bca970d21372235f52fd0f8fde4cf344c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC4 5508 bytes
font_01_sfnt_off00008f83.bin
27365d14a24f871a6e4ebd6f91ee5ab71fec8c83374d681c25ba9f63361fdc9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F83 10788 bytes
font_02_sfnt_off0000b4c3.bin
09924711e23a1c98877ce56c16e1c939238a0f728f271096c50c76ac4b5e6340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 3572 bytes

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