Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4a6fafe6dbb053…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 20:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf9245d742da45001f351c09e46e8aef SHA-1: 1aec31cf0f691c0439e60398d875147059e1db37 SHA-256: fd4a6fafe6dbb0534c7c68744afa3c09dc5e3d2ece569619bcde1efaf23526ea
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic indicating it contains a link to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links. The primary malicious URL identified is https://ttraff.ru/wix?keyword=wallpaper+free++for+pc+windows+7, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains this URL and other embedded 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/wix?keyword=wallpaper+free++for+pc+windows+7
    • https://static.usrfiles.com/ugd/c5d40f_5503d3868a63429d96e0f0e1ada2b641.pdf
    • https://static.usrfiles.com/ugd/b972d5_f2cca8359f5a4400917dc0cfa3937acb.pdf
    • https://static.usrfiles.com/ugd/3e5d97_731711f56a6449dbb33e2b6a8b14e589.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/widakugesitosalinozidope.pdf
    • https://cdn.shopify.com/s/files/1/0437/8899/2674/files/78270227813.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/vuxexuvelafidixekasapenad.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/pewedimazuzapuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/2955260426.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/66743282592.pdf
    • https://cdn.shopify.com/s/files/1/0438/4741/8016/files/95874829502.pdf
    • https://cdn.shopify.com/s/files/1/0461/7230/7609/files/audio_call_recorder_pro_apk.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_off0000600f.bin
6136bd0769caa884282b136979d8964bbbab2627c6e2c3391ba048e77be25b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600F 5336 bytes
font_01_sfnt_off00007265.bin
f5a169200b90279aa3c724ef73035bf36241dd38bbc1c69bf566642af0e15ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 10196 bytes

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