Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85853cf8d58af0a…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 21:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f5a9d5c07786f8a681e6850bfb98da SHA-1: f8f03fd84c62edbce8f8c553e196bfd046deae3c SHA-256: f85853cf8d58af0a622ac4b6708aabdcc779586c7fda469c1db47cb13ef93ef1
150 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 pointing to 'ttraff.com', which is further supported by the document body containing the same URL and a lure for 'ccs c compiler crack'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wix?keyword=ccs+c+compiler+crack
    • https://static.usrfiles.com/ugd/0ebc1f_3091e674d66d4c69b7755bc00f1ca348.pdf
    • https://static.usrfiles.com/ugd/39cb9d_4888d36c48e3482481f928d3a20f439e.pdf
    • https://static.usrfiles.com/ugd/e6092c_6eecf566ecc643d38b34c4ab586722ae.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_86f9e5a8c9714277b54091d01debbf76.pdf
    • https://static.usrfiles.com/ugd/b28561_5e09688b872d488b9eb033c504739d5c.pdf
    • https://static.usrfiles.com/ugd/38bf1f_18b7483a23ce429288871bdbba432555.pdf
    • https://static.usrfiles.com/ugd/cf79db_ebfff27489774b168a9835be7414d08f.pdf
    • https://static.usrfiles.com/ugd/cac9e4_d39b62ce851348f5b7f1a05d734bbd40.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/shipper_export_declaration.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/xenifofigudotefivul.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/download_caballo_de_troya_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/venanosenemijiwejojuzeru.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/xasumosuvekodega.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/dora_kiss_cartoon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/parerigulux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/52701497823.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_off00005bea.bin
0850afcdac9a5e1a8d635ffabca21d32fc9fbd1bf13a1814bbba89c4ffced4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEA 5048 bytes
font_01_sfnt_off00006cee.bin
bb8addac49dbd3c2a0fe93b204334ed574b3de975321a0e15e2af0cd29dfa33c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 1676 bytes
font_02_sfnt_off0000753b.bin
3d9ba73bde8e72e8c355e80affb6f54fb3ca41ee2761efdcee1bbc181d375be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 10016 bytes