Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafc4148fbd2de3d…

MALICIOUS

PDF

45.7 KB Created: 2020-09-02 03:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 078cc7e8b64b392775d094d1c363386b SHA-1: 8196c9e8f964edc4bf52cb424fe43f5e1243bda4 SHA-256: dafc4148fbd2de3dd705fe73a98f16bf2d8a81301bfbbcd24367ddd7fc7bed16
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=ran-+metformin+500+mg+side+effects'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking PDF links, suggesting a lure to a malicious site under the guise of providing information.

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.ru/wix?keyword=ran-+metformin+500+mg+side+effects
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/13513162859.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/sawikesi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/41074933472.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/66791673366.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/action_linking_and_helping_verbs_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/zifavijapopos.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/39296738436.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/sojoxegapuvuwawi.pdf
    • https://static.usrfiles.com/ugd/c63dba_9f7f889c7be142879e435e78afe279cf.pdf
    • https://static.usrfiles.com/ugd/353d00_e469bb4612d548618199b24a5a86476f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7f3323a89c64a8aa3ed0d55cb159bc6.pdf
    • https://static.usrfiles.com/ugd/0f5b72_54f036d63c7841dc8a88567c6a9fd4db.pdf
    • https://static.usrfiles.com/ugd/b8c837_c558f0fe94124d7e8cb83514f51fbdba.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5dee3ed256d4d3ba68fd5e3a17e7059.pdf
    • https://static.usrfiles.com/ugd/bcd086_1dbc0a107afb4b24bce0bf055c4881b8.pdf
    • https://static.usrfiles.com/ugd/5ed537_e1eae282c0d443b2a33c8c541f441c48.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c47477d0a47479489360f4e2d25dbbc.pdf
    • https://static.usrfiles.com/ugd/48d9a1_159de59ae775409184fc0e94ed47dd84.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_off0000735e.bin
0061bc441de68bbfb0638162636425e95bebef828aacb0a3fae7772bbff05326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 5612 bytes
font_01_sfnt_off00008670.bin
a2fc582e2b3eedca180a1338c4311125ef3c688d7d128b0388db9bdd6cea9076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8670 10424 bytes

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