Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fb0daf58b4c80e…

MALICIOUS

PDF

53.6 KB Created: 2020-08-23 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28d25708109897fbfc622fb6e82826d SHA-1: 70c8cdfb93fd2975a23f906a36c90dbe5ec1f31f SHA-256: 23fb0daf58b4c80e9e5c4b753c1968545ef395d360b3f62a9ada2a9b4b4f3e51
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=excel+indirect+reference+another+worksheet'. This indicates the document's primary purpose is to redirect users to potentially harmful sites. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=excel+indirect+reference+another+worksheet
    • http://files.pawneeil.net/uploads/1/3/1/4/131406650/582d8a336ff5.pdf
    • http://files.conquergoodcreative.com/uploads/1/3/0/7/130775997/3134228.pdf
    • http://files.desmidtbuilders.com/uploads/1/3/0/7/130739330/3274354.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/jedijuwetetiwuzasakovim.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/38888173352.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/85982643478.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/kupunitugopunufila.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/61309980201.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/12816351587.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5976/files/vampire_weekend_full_album.pdf
    • https://cdn.shopify.com/s/files/1/0429/3663/1452/files/kipabiwava.pdf
    • https://cdn.shopify.com/s/files/1/0437/1474/0375/files/10694617403.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_off000085eb.bin
50079494b83dd175250f4b927a5f2f13ef6d5ed1b263eecaeca839d4aa119e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EB 5076 bytes
font_01_sfnt_off0000972c.bin
a8f9af2db098a9e99beb5936c2a52b07c03bdcafc3d0ad8967850c5eae8776a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972C 10544 bytes
font_02_sfnt_off0000bb39.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 4324 bytes

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