Malicious PDF — malware analysis report

Static analysis result for SHA-256 434f2ff6140127eb…

MALICIOUS

PDF

35.2 KB Created: 2020-08-24 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a686ebdb45100676798fb5b15251a13d SHA-1: e39c5b2413d70c1dc75c45d603d744c83391b8e3 SHA-256: 434f2ff6140127eb7d6d375283849196fa77a6160ef81df7989e50f72a935917
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a redirector service, which is a common technique for distributing malware or conducting phishing attacks. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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=vibrate+when+call+is+answered+mi+a3
    • http://vinof.civicstudy.com/uploads/1/3/1/1/131163857/datuxegevipewenavogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/rixajivonamilinoxalik.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/renogixosegojuvatav.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/49450050989.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/final_fantasy_lightning_returns_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/n_f_i_r_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0085/files/30855772607.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/lixezep.pdf
    • https://cdn.shopify.com/s/files/1/0434/0747/4844/files/tisutepaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/nadopogod.pdf
    • https://cdn.shopify.com/s/files/1/0446/6363/6131/files/bash_rename_file.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_off00004b8b.bin
9204cd63b7ec67e7416d27ed74331c6a74cf2d90a0ebda77c5526a268e989be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8B 5540 bytes
font_01_sfnt_off00005e38.bin
8961a35b71d8202a289778f5dbf738c20ebd3d1df06c632ca8edf80938713ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E38 10016 bytes

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