Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba049ac730fe0de…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 04:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51e4a7cfd5060c1048edbe75b0f4810 SHA-1: 70b3a957b52733f22cb4090e0c75f4de733e72ff SHA-256: bba049ac730fe0de2d1cf4acb6d05bb96d53a1a59079e6b6485ccf023a922f31
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is used to redirect the user to potentially malicious content, as indicated by the 'happymod apk android 1' keyword in the URL. The document also hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm for SEO poisoning or to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=happymod+apk+android+1
    • http://pekoroso.greaterthingshealth.com/uploads/1/3/1/1/131164250/xinobobil.pdf
    • http://files.nitrofoundation.com/uploads/1/3/1/4/131438899/260d2d60205b8e2.pdf
    • http://files.emmaryanski.com/uploads/1/3/1/4/131437005/tenamolopusenowuju.pdf
    • http://files.kilsythcommunityfoodbank.com/uploads/1/3/0/7/130776503/sewefumatov_rogidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/major_depressive_disorder_dsm_5_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/tuxagukixasozojazixota.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/kegolunuvafasonuxigezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/zunudizuxemikojolanosinal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/howdens_kitchen_cabinet_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/80173351919.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/78343050657.pdf
    • https://cdn.shopify.com/s/files/1/0439/1138/1147/files/how_to_remove_a_like_from_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/joyce_meyer_be_anxious_for_nothing.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/velawajolakoverofavokosa.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_off00005268.bin
7a26468682728630c23b568d4f77e82f878fb37316b91f44269670489a518db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5268 4664 bytes
font_01_sfnt_off00006219.bin
65ab02e0b2855d954622db5c45d5e3b288da09bb34483c962883250c9776e718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 10324 bytes
font_02_sfnt_off00008562.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 4324 bytes

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