Malicious PDF — malware analysis report

Static analysis result for SHA-256 293710265d938c0f…

MALICIOUS

PDF

38.4 KB Created: 2020-08-20 23:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa9cfd4fa966b4cff71c59b307142559 SHA-1: ce9ef4f587c38ee0ba9ad1d15fe124bb46ea168a SHA-256: 293710265d938c0f1febbf4c0ea2078f3cefab2ba7f2d69138b9c3004202e9d2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=formation+afnor+2018' and multiple shopify URLs, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious.

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=formation+afnor+2018
    • http://files.hideawayfarmar.com/uploads/1/3/0/7/130740573/pipevoponakigukukim.pdf
    • http://levuxupu.asdarchitects.com/uploads/1/3/1/8/131856166/rudepadaxubabokelepo.pdf
    • http://files.stayinthearena.com/uploads/1/3/1/4/131409090/wagetukerifepojes.pdf
    • http://files.auntiearwenspices.com/uploads/1/3/0/8/130874154/jelanagami-gebelotibedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/pevutowibomuxetumokev.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/xizonuruximi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4211/8555/files/battle_run_hack_no_survey.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/fazigijifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/how_to_greentext.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4657/files/lakulenenagak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/nunoxasixox.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/cauchy_schwarz_inequality_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/material_design_shadow_css.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/28257722120.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/ravasuw.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_off000057d0.bin
fd4fa5292d06949454e7a0655e137b226c84d4e49ca4d6179eb599f50d2bf896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D0 5180 bytes
font_01_sfnt_off00006951.bin
c1140f8db7f84b7b854b0b1c1a8af310f45556eb75979395312124b665faaa2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6951 10016 bytes

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