Malicious PDF — malware analysis report

Static analysis result for SHA-256 91183186cfb311f6…

MALICIOUS

PDF

44.3 KB Created: 2020-08-14 17:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f5b3893e6740b9538b451a9f690337 SHA-1: 749349f93871b72f92c08c055d01ffaebfe12364 SHA-256: 91183186cfb311f602b3d5b8bf71b302dc89185a9bebde9b72b17bfee4ad6869
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 one identified as a malicious redirector and others forming a link farm. The primary malicious link is https://ttraff.ru/pify?keyword=chapeu+de+formatura+imprimir, which likely leads to further malicious content. The document body is heavily obfuscated and contains remnants of the malicious URL, suggesting it's a lure to encourage clicks on the 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/pify?keyword=chapeu+de+formatura+imprimir
    • http://files.launasorensen.com/uploads/1/3/1/1/131163782/moxotikosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/rusazuwozaposanafuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/siluwogugaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/27390780880.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/jewigi.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/poferokudewunirosuvagug.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/97907490294.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/68402697167.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/kolosatubav.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/volo_s_guide_to_monsters_playable_races.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/fufidobusoxawewagujow.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/95247423076.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_off000057bc.bin
8a68cbbef386f679ca0f9f94f3ed23e703520a08adb5aebb19c1500799805aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57BC 4868 bytes
font_01_sfnt_off00006855.bin
a40a0970bce99a1dd93d81f6f4e121bb1ede4f49be4cd1beacb4785f81e5558f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 15404 bytes
font_02_sfnt_off0000950c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x950C 4324 bytes

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