Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5347eb8f97a2027…

MALICIOUS

PDF

57.6 KB Created: 2020-08-15 16:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1dd65f993d9bc7c449189ccee7ee5a2 SHA-1: ce2e9062d29269ce225eae89974c9b64984b99c5 SHA-256: b5347eb8f97a2027b0fb95a757256336748e7b78167955f590a46f28b5d866ff
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used in conjunction with the lure text "Prosody examples pdf". The document body, though heavily obfuscated, contains the same lure text and the malicious redirector URL, confirming its intent to trick users into visiting malicious sites.

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.cc/wb?keyword=prosody%20examples%20pdf
    • http://pakured.marygoldsteinpt.com/uploads/1/3/0/8/130813612/6438007.pdf
    • http://dewexiwim.happysnapsstudio.com/uploads/1/3/1/1/131163763/6fdfd1b460e6d8.pdf
    • http://files.celebrating40.com/uploads/1/3/1/3/131379868/woxidurugonekekevuk.pdf
    • http://files.moniquevek.com/uploads/1/3/0/8/130874469/jiwuzejimik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0434/6281/9990/files/22223931225.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/infinity_alt_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35543542817.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/38757736990.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/lupakenipedomuwip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/61397249913.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/jasexudumukobutikugevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/embodiment_of_scarlet_devil_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6074/6648/files/nursing_code_of_conduct.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/example_of_application_letter_for_immersion.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/fun_speaking_activities_for_adults.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_off0000a28e.bin
5f67c451c90d45c3275853a32d1cd14a0df76f55d078d8cbf9b74f3b0f7e288b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA28E 5360 bytes
font_01_sfnt_off0000b4bd.bin
e6d82e02181ab7598dee870d8fe9b8be8d18aefc694f446eebd2f7f646b5e99e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 10656 bytes