Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c843c49d5c66b54…

MALICIOUS

PDF

67.6 KB Created: 2020-08-05 04:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b113751d5d99ec40cfcd6ddceed521f SHA-1: fd67e6a8e504141d1c09979890627af7cf40d9c8 SHA-256: 4c843c49d5c66b543997a60c80ef23ac09c291b6e60dd2fcc2f2844052027f59
150 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, specifically pointing to 'ttraff.ru'. This URL is presented to the user within the document body, disguised as an 'employee contract letter pdf'. The file also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering, tricking the user into visiting a malicious URL.

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=employee+contract+letter+pdf
    • http://wikisuve.annimorris.co.nz/uploads/1/3/1/4/131407921/694b2fa2e.pdf
    • http://files.sswonline.com/uploads/1/3/1/8/131871467/benab.pdf
    • http://files.yourernow.com/uploads/1/3/2/7/132740291/lirejefotiwop.pdf
    • http://files.chromosome3andme.com/uploads/1/3/1/4/131454355/watabijexupo-jagaxepefuj-pezubewajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/72406639921.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/saxuzar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/7503360304.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/40504766991.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/56488974331.pdf
    • https://cdn.shopify.com/s/files/1/0431/1652/7770/files/vukerij.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/samsung_bd-_j5700_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/gawetopavakuketenisaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/4442/0246/files/605625987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.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_off0000c1f0.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 2828 bytes
font_01_sfnt_off0000cbea.bin
9a16afc6263fc4f1c24069d19f4c74b75d2812a7c0690865a3526d1caf21f552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 5180 bytes
font_02_sfnt_off0000dd84.bin
78b4af45111b644c45a1d560b2667ed36616001c8162c8cf848f479b9144b695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10332 bytes

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