Malicious PDF — malware analysis report

Static analysis result for SHA-256 926e731ba3a54a85…

MALICIOUS

PDF

40.2 KB Created: 2020-08-18 19:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb06a20ac90b1a1a06329f24196e16e3 SHA-1: 98a312191dbd422c0f7b19ac8d5d257f8543ba4a SHA-256: 926e731ba3a54a8518abf1786e3caffc007965c0e9d87ecdc65f28438f13b271
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, a technique often used for SEO link farms or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure via the URL 'https://ttraff.cc/pify?keyword=sum+of+interior+angles+of+triangles+worksheet'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many pointing to potentially untrusted domains, suggesting a phishing or redirection attempt.

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/pify?keyword=sum+of+interior+angles+of+triangles+worksheet
    • http://files.boomerbones.com/uploads/1/3/1/0/131070842/vuletekufobis.pdf
    • http://pativis.mpiireofficial.com/uploads/1/3/1/6/131606056/bixolukulijure.pdf
    • http://files.artisticreteleesburg.com/uploads/1/3/0/9/130969709/malolef.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/elementary_book_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/tinkle_double_digest.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/sideg.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7751/files/attendance_system_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/22886091855.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7207/files/90074378848.pdf
    • https://cdn.shopify.com/s/files/1/0434/9437/5576/files/zogatasodulu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/19317225595.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/cardi_b_lick_music_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/0334/6078/files/rogaxatiwapodogofuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/cites_appendix_ii.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000516b.bin
887d97ca6be37051aa4f5cbc6fdf606523fcb303faed0c6ff0e756c92a108e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x516B 5320 bytes
font_01_sfnt_off0000635f.bin
0bb26369f7e51efbffdf7a2c014b331ad9cee1caab8bd7e28a10b94e0b94c3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 10000 bytes
font_02_sfnt_off00008583.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8583 4324 bytes

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