Malicious PDF — malware analysis report

Static analysis result for SHA-256 403c32c70f0306f2…

MALICIOUS

PDF

65.1 KB Created: 2020-08-04 18:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86841048408dfd57892dc4315c52b76e SHA-1: 28ca5fc8fa170cb0f03aff4dcdef28577aa6d026 SHA-256: 403c32c70f0306f285f27a79e426f7100d38bd11a076ae709799f4b4981ab701
120 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, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised with a keyword related to Huffman coding, suggesting a social engineering lure. The file also contains a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or distributing malicious content. No scripts were extracted from this sample.

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=huffman+coding+algorithm+pdf
    • http://files.lightningkali.com/uploads/1/3/0/8/130873851/suniviwutajisa.pdf
    • http://files.hannahtounsend.co.uk/uploads/1/3/0/9/130969922/womudal_jubujikerobu.pdf
    • http://files.gcmorchestra.org/uploads/1/3/1/4/131438419/1194070.pdf
    • http://files.algaebookandpaper.com/uploads/1/3/0/7/130740211/3187647.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/85584554451.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5619/files/70103429230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/xemodeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/jepuzigapatixafumamazo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4850/8311/files/19385215031.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/38064352933.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/watch_the_possession_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/22189451733.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/79666399372.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/wepisepab.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_off0000a283.bin
40531a6911ad3323ef9ec0fed9ad876963e32dbbed0a9422c7d4b544b8f6dcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA283 5352 bytes
font_01_sfnt_off0000b488.bin
837837c225a6b6bfad3eff5b3c07e4283aed3892f550daacd67261bc8c79640a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB488 14140 bytes
font_02_sfnt_off0000e195.bin
9def142226f437a2ba4283d976d890154c0e2dbb92bc97532184205699c6e9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 16148 bytes

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