Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d85633e4ba7b11…

MALICIOUS

PDF

41.5 KB Created: 2020-08-19 18:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b545d05b284782f52349be9ddaf70079 SHA-1: af23e6862a2a326791d390566f1855a3905b58e2 SHA-256: 77d85633e4ba7b115aa2d900aab27d916b6571362833cd2d472e26303e1d770b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and references a 'dissertation report', suggesting a lure to entice users to click the link. The presence of numerous other links to Shopify-hosted PDFs indicates a link farm strategy, likely for SEO poisoning or to host further stages of the attack. No scripts were extracted from this sample.

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=dissertation+report+means
    • http://files.iliveinmycarandeatverywell.com/uploads/1/3/2/6/132681931/97eb25bb1bc37b6.pdf
    • http://wowalo.johnhunterdesign.com/uploads/1/3/1/4/131438216/kuvujutimuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/jebikabojirofekuzetigof.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/mamavomuniz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/puxusopupap.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/39975830167.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/41464478079.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/foxovakulelosadisesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/xegazed.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/82541839677.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/comment_citer_un_dans_une_bibliographie.pdf
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/how_to_center_a_div.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_off0000657d.bin
8c6b47566ba60510f902bda4600a928d374878da84fa800e1c2d993ffd94574b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 4932 bytes
font_01_sfnt_off00007628.bin
3203db3cb13d954ae4a55cc249dfa4e25f213157d7a12ae37cf25db458484bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7628 10976 bytes

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