Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d6b742ebd6c6bc…

MALICIOUS

PDF

51.6 KB Created: 2020-07-30 01:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a26352641d0b5d7d4ca19258c1777c18 SHA-1: 8091c2b7eab8529ea0e7fd0f557930ae2a7435d6 SHA-256: a8d6b742ebd6c6bcf29c59f541dfbb54760fd3f4098fce1252df69d8756bf22a
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. Additionally, it hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. The document body, though heavily obfuscated, contains references to 'Casio g shock owner s manual pdf' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious intent. 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.ru/pify?keyword=casio+g+shock+owner+s+manual+pdf
    • http://files.youdeservetheword.com/uploads/1/3/0/8/130814531/xediw_tezewazowebewi_feliji_kugino.pdf
    • http://files.skyshedpodpa.com/uploads/1/3/2/6/132695438/tabeduvexu.pdf
    • http://files.therusticacrellc.com/uploads/1/3/0/7/130775304/4846230.pdf
    • http://files.atlantaillinois.org/uploads/1/3/1/4/131482828/f10a2.pdf
    • http://files.therusticacrellc.com/uploads/1/3/0/7/130775304/48462
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/jawezavubekajuzetudexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/29667682584.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/xevogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/75647999163.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3398/files/doxud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/47221069280.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/60340489061.pdf
    • https://cdn.shopify.com/s/files/1/0430/4705/9607/files/88067651870.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/18021744445.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/xuseguvuputevakufopowes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/ziwajusejapipamidebagas.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_off00008aac.bin
7e178cfb98227b9cbd138aa3005c59ff8d2f25d831a7f7c342e4ad99bef3926e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAC 5548 bytes
font_01_sfnt_off00009d64.bin
a17bd2c7a986193b3c5f8ca5e9335346b2458226d7664268f744cc54ccbc8d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D64 10540 bytes

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