Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c885fb1ec260c58…

MALICIOUS

PDF

49.8 KB Created: 2020-08-30 02:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de46e31823465fe2c39346a825384035 SHA-1: d72093bd6ae8cfc1b63f720186b0395f241d409c SHA-256: 8c885fb1ec260c58b3cc66c8e71380463ec6739204e4a2ffc169dcee7b3def42
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.me'. This link is presented within the document body, disguised as a 'guide to bts universe'. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=guide+to+bts+universe
    • https://cdn.shopify.com/s/files/1/0439/3972/5470/files/37209983633.pdf
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/88283694411.pdf
    • https://cdn.shopify.com/s/files/1/0431/1328/3735/files/world_political_map_black_and_white.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/python_threading_example.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/99579475549.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0464/files/kowexigazipijeporera.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/fugularajujuziwire.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ca98d220124fa3a1cbac718eb95ff2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e932bb83e56f44c2acd3c97be955dd67.pdf
    • https://static.usrfiles.com/ugd/de60da_bda237cb7af647158c7d99fdbd2236af.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/vusolokivesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/29764544388.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/sajaxusazedobikuvapigom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5563/files/46166450083.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006779.bin
aebf40e077e86e87551affe82c7c242d5b0a7a166d49a04ea14836980e70697c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 4980 bytes
font_01_sfnt_off000078cc.bin
3f8c4f9fc847ab1ca60376a0b3fa3aa6ee1a8f291c4ee9423f17e9b91f9f8260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CC 4692 bytes
font_02_sfnt_off000088c7.bin
05be8f856c84f462afb48b99a0f76dbd21327b568d253946db83c882ff0cedc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 10308 bytes
font_03_sfnt_off0000abfc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFC 4324 bytes

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