Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb4da5a8ad7e791…

MALICIOUS

PDF

48.4 KB Created: 2020-08-10 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b99a11dc6bc4f6f6c56b62bcf033caf7 SHA-1: 427c292b8a70ec0760229300fba197dcdfed19e1 SHA-256: 7fb4da5a8ad7e791a26c509e906a691d66d541cd0ef41664abbf7b9667cb447a
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URLs, particularly the one pointing to 'ttraff.ru', are indicative of a redirection scheme designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is the delivery mechanism for the malicious links.

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.ru/pify?keyword=algebraic+geometry+gathmann+pdf
    • http://xeborazi.pressurewashingnorthlasvegas.com/uploads/1/3/1/4/131482976/7984051.pdf
    • http://files.breathingspacecounsellingpractice.com/uploads/1/3/0/9/130969580/rururinotinoro.pdf
    • http://zejesix.northcountyhumanresources.com/uploads/1/3/0/9/130969551/a00c4ea4.pdf
    • http://sekivom.dulcetdecibels.com/uploads/1/3/0/8/130814328/numeja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/midejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/nijabitaponagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/poe_leveling_guide_70.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/pofumuzubosijiwux.pdf
    • https://cdn.shopify.com/s/files/1/0439/2806/0059/files/p90x_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/57104643177.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/68152232889.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/3740156962.pdf
    • https://cdn.shopify.com/s/files/1/0430/9807/9399/files/bojipu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/papulabowowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/36070571751.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_off00006f76.bin
bec104bafd1033a6e6b62f11b26c0719d84808bbd333dd70c15752a94b34aed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F76 5412 bytes
font_01_sfnt_off000081b0.bin
94c8a6c5b856f4020127182ccb55d06a7fa35426cfb75737320c6e35119f0bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x81B0 10756 bytes
font_02_sfnt_off0000a640.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA640 4324 bytes