Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c7b30cc16546c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-09 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0200d5efe2703e9d03e91a17654ffcc9 SHA-1: fff9f18d83af3802b6fdf59c005fd408c5bf084a SHA-256: ac4c7b30cc16546c362a3f28063fcfe4487b45b1fa19e74b7a51358b6cd33ada
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, forming a link farm. One of these links, 'https://ttraff.cc/pify?keyword=cctv+camera+pdf', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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=cctv+camera+pdf
    • http://files.storybookhedgehogs.com/uploads/1/3/1/3/131380292/9838286.pdf
    • http://files.summerjhb.com/uploads/1/3/1/3/131384643/patisikoxuziboni.pdf
    • http://files.ceramicsandwood.com/uploads/1/3/0/8/130874339/sipitawujikukuraxile.pdf
    • https://cdn.shopify.com/s/files/1/0430/5613/6341/files/10033600802.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/lekobukojosidog.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/69864616407.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51031200676.pdf
    • https://cdn.shopify.com/s/files/1/0437/7631/1447/files/blogging_for_dummies_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/tejibamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/jetononunofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/mejizovedavaduvokovufumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/bivakotedusegobojari.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/motezazelowuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/45110755099.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_off0000662c.bin
eb1b39336d0d9a3ecb5f0dd799868cb0ea8eac1c7643b04c260a36120a22ea57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 5056 bytes
font_01_sfnt_off0000774d.bin
e29fffd95236b4190178a186d1b9eb69c0e03aec9f1e2b12da898e35dc2e9f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 10688 bytes

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