Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a32b2b70c930b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 15:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33887b92e9dbbd2cf16e230ce744f77c SHA-1: 5ec96c5d9527383cf09596f69415ce8c54d0e25f SHA-256: 7a9a32b2b70c930bc52034ae493ebea392255ba45634cad6ef58ca66139fca7d
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that are identified as a malicious redirector and part of a link farm. The document body, though heavily obfuscated, contains text related to a 'date sheet' and the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site.

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.com/wix?keyword=10th+class+date+sheet+2019+balochistan+board
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/dish_smart_pack.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/kekutidewotobip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/33694950704.pdf
    • https://static.usrfiles.com/ugd/15cd4d_452c5a9f3ae44381bdc8bbe4c008b763.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_ba046b0a123143b78108f97630f04b0a.pdf
    • https://static.usrfiles.com/ugd/314c35_6315f15dcec343ee96b8974dd1b173db.pdf
    • https://static.usrfiles.com/ugd/b7ed05_cc2b791508d14c45848f510590a583d7.pdf
    • https://static.usrfiles.com/ugd/06497e_0149e44d3107440881c59ed9b87e2c04.pdf
    • https://static.usrfiles.com/ugd/e2f197_0607020f840340b3a934a0d7a7b302f4.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4789/files/29005009484.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/3436730221.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8688/files/fahrenheit_451_character_analysis_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/exodus_3000_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e94.bin
79fd7d0067146405259d8ed169958f1061e61b27c665e7d1a171e0108974f6c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E94 5552 bytes
font_01_sfnt_off00007160.bin
7fb6c2433b60b05cea3ea3d0a7c2bc563b7f481413bdc45a8ab8816b03f0d28b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 11272 bytes