Malicious PDF — malware analysis report

Static analysis result for SHA-256 f772bd14a31c3bad…

MALICIOUS

PDF

35.9 KB Created: 2020-08-19 23:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa22ca8e00e39256f9b97931c89acbc1 SHA-1: 3c22016b05a6ae0d324b23868a4e4bfba8441fdf SHA-256: f772bd14a31c3bada812260ec4644960e111b9b7551da7a19cf79dc70a53babb
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, pointing to 'ttraff.com'. This URL is presented within the document body, disguised as a search result for 'clarinet quartet sheet music pdf'. The PDF also contains a link farm heuristic, indicating numerous external links, many of which point to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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.com/pify?keyword=clarinet+quartet+sheet+music+pdf
    • http://files.lifelineao.com/uploads/1/3/1/3/131379844/nimebujujopimilig.pdf
    • http://tujokudum.kittoconsulting.com/uploads/1/3/2/8/132814930/razuwuvapinitab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/55998782568.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/jatufewupekasijasejuguxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/97985290432.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/redefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/gikazen.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/chanel_west_coast_nude_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/gazafotovewafirawunawemar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/68753762270.pdf
    • https://cdn.shopify.com/s/files/1/0432/7751/6955/files/testout_security_pro_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/gaveradoremobu.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_off00004d84.bin
7e09eb2d705b80097567bf3562075c9ccfe2b06835bfeb70c5b72b6a49c5a8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D84 5428 bytes
font_01_sfnt_off00005fc3.bin
7d754c4b0c38cb0eebf20f7f72c775cc1e6cdd332786dfe88e06826bcafa9493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC3 10348 bytes

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