Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f0b3a3569314bd…

MALICIOUS

PDF

33.3 KB Created: 2020-08-31 01:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 651a675e69726f9bec351b2bcf7a80d8 SHA-1: 1c6f287e3c7d8a2c1f97c6f04850c45113a9e86a SHA-256: 19f0b3a3569314bd68770d3ef2df3ff896c21d1cb468563d6a74d76be4608190
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic firing indicates a malicious redirector link to ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body is heavily obfuscated but contains the same malicious URL, suggesting a social engineering lure.

Heuristics 3

  • 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.
  • 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/wix?keyword=counting+stars+one+republic+piano
    • https://static.usrfiles.com/ugd/4d935e_bec57d63d9804a29b67684658a987fe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_97e2640bd1cb497eaffce27b09671eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ca6ecbbfc2341dfb0bd62308cb361a7.pdf
    • https://static.usrfiles.com/ugd/c63dba_9243b6dac7804392880ec3466cb69c98.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/69821724876.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/40901989337.pdf
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/wogudidesorewigareru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/genitoseluziwotefutot.pdf
    • https://static.usrfiles.com/ugd/db93e9_2c7567515f604567a319c414a89beb96.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b0291f9c78495bab1a7d9d37955ae1.pdf
    • https://static.usrfiles.com/ugd/b3bc21_2c12acef78bf4f46b44cafd209ed0850.pdf
    • https://static.usrfiles.com/ugd/b8c837_5208850d615b41f9b108a44c31f19077.pdf
    • https://static.usrfiles.com/ugd/37428b_ac0b57e3df324dd993ccb0056ae2746a.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_off000044e1.bin
df38ac9fa3b92b8ef59411fdb15ba363654e4d0cf468608318701d8f5e74afd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44E1 5144 bytes
font_01_sfnt_off0000566b.bin
8c7351f5c9260f4d1b8256f6b922acce3c90c105ff1ef7e706ffb39b6a6fe791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566B 10224 bytes

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