Malicious PDF — malware analysis report

Static analysis result for SHA-256 baebea61c48bf922…

MALICIOUS

PDF

66.7 KB Created: 2020-07-30 08:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca61e2d80444ab0dcc2f7b2a027a4f6 SHA-1: a7aa7f11812abee20d628467e63706ec66b9d6c1 SHA-256: baebea61c48bf922c70663c8479bac431f5da8119e9ac3b1b1a7b237af5a2d6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=hedonism+philosophy+pdf
    • http://files.usasurvival.org/uploads/1/3/0/7/130738850/39db23440928323.pdf
    • http://files.elainethelibrarian.com/uploads/1/3/0/7/130775267/dezotiwefuzu-besowi-zirus-gopavin.pdf
    • http://files.tabithasdesigns.org/uploads/1/3/1/6/131636808/a5d7d47270.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/boxijexido.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/11738889860.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/berokivomer.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/gexejuwuponatigepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/63830284809.pdf
    • https://cdn.shopify.com/s/files/1/0431/8081/8581/files/63962824689.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/jebozuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6887/3112/files/doxogomuzumaxanubuwerepab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/17768001067.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/90518978564.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/48700669036.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/wolunagemevepadani.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/81442573517.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_off0000c2ee.bin
3b0b77eee6947d8305f7c8145d99dfbfdd1fdcd264d06b5854bec4a4f881154c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EE 4744 bytes
font_01_sfnt_off0000d2de.bin
58f7441cda3f8abc216cef7127bc8168864d8c7302c28c0b70220ba658595d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 13260 bytes

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