Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7850cc3c7d9a8c…

MALICIOUS

PDF

39.9 KB Created: 2020-08-27 18:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db7eee5e3f43d100bc5e0f66b133d913 SHA-1: 3d4e0b49a8b2b730aab11bff8d5540ee2852b2be SHA-256: 2b7850cc3c7d9a8c841c0072c97180c476471d5c35da72278b15fa7094e74fb6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of these links points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the URL for the malicious redirector, suggesting an attempt to lure users to malicious content.

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=neurological+music+therapy
    • http://wusavo.livinginnobility.com/uploads/1/3/0/7/130739922/43d239e7d2.pdf
    • http://files.massagebyaxil.com/uploads/1/3/1/3/131383456/0ccd6bf934cda5b.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/bg2ee_mods_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/68500276200.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/rapinurulatogadunofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/32209079392.pdf
    • https://cdn.shopify.com/s/files/1/0444/4743/2871/files/99968071580.pdf
    • https://cdn.shopify.com/s/files/1/0440/1856/5278/files/11240419386.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/wupidavujinoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/mibadixikepox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4471/6199/files/dasezud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/65929808338.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3b.bin
c8c8e11f27ce37e042bc5dc6bdbfca5ae655b14d83c3a359dd2b4ec4590b9e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5420 bytes
font_01_sfnt_off00007198.bin
2d5338eb4db05032fdf6c33837d25c80850fde6d83284c60b8204d95e101bdc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 9688 bytes

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