Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cfcacaf431a59b…

MALICIOUS

PDF

37.8 KB Created: 2020-08-12 21:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fae58276b5fd20ba91fe4771db71bdc SHA-1: f13cbc905b57aa81cb442b5afe7c3fafa77d0a61 SHA-256: 93cfcacaf431a59b0ee6df6c8c76559022c9162ac9c62f839226c788f05974a3
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link to ttraff.ru, indicating a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains the same deceptive title and URLs, reinforcing the lure. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=discrete%20structures%20of%20computer%20science%20levy%20pdf
    • http://files.dundasstudiotour.com/uploads/1/3/0/7/130739155/7600432.pdf
    • http://jujaritu.overhauls.info/uploads/1/3/0/7/130738531/zilodij_diwokole_sizogivuben_ponikilixutinuv.pdf
    • http://files.pahasapagrotto.com/uploads/1/3/1/0/131070313/3b5e1fe.pdf
    • http://files.thebsquadproject.com/uploads/1/3/1/3/131383380/3928268.pdf
    • http://files.lawnritechichester.co.uk/uploads/1/3/1/0/131070207/movowubobosed.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/45521062341.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/60516375719.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/widizowinorusinurowewefut.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/lumad.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/88275340676.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/application_letter_writing_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/44926635281.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/6017544040.pdf
    • https://cdn.shopify.com/s/files/1/0437/3043/6247/files/75985762839.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/46426620542.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_off000055f5.bin
6983be88254c519f1ed51f8eee2e9163627401fb00651d538ae22b5ef65b7cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F5 5252 bytes
font_01_sfnt_off000067c8.bin
3d36cbc3773f3cce4da28afdb0e7b40815782f2a0bd69871314c9435354d9ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C8 10028 bytes

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