Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbabf66be067d45…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 17:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccca40dad6535c2ad17118064c26ae79 SHA-1: a764e6288f3cafa2805b6541a003780e7d4fd483 SHA-256: ccbabf66be067d45e1954694c40bedf5936fd5f310e5e2156acea536de82d123
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'keto diet book pdf'. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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=keto+diet+book+pdf
    • https://static.usrfiles.com/ugd/b8c837_d5604d5f2d7741efba6f247756932ddc.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_85f79c1aa13f436f9f986696dadb8072.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c05a8106e4f4d20abb1ec9ebb321216.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/27800165572.pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7635/files/islamic_calendar_2019_one_page.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b08894991047e582f1b28c977478ce.pdf
    • https://static.usrfiles.com/ugd/2274a7_8450864db4d6451dab565d9f55c1f85d.pdf
    • https://static.usrfiles.com/ugd/2c608b_e10b9d454e484664a080f0d89cb03f29.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/84475108987.pdf
    • https://cdn.shopify.com/s/files/1/0444/3917/5335/files/definition_of_capital_market.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/paddy_chayefsky_network_screenplay.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/44183873142.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_off00006aa7.bin
e622fd9025462eae3ef64327603a2f5f5f929749058d705d38e2843e71d08d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 4692 bytes
font_01_sfnt_off00007ab2.bin
2c0918c748b4d9a081e54a30e04ee56909d3a08d17f0b530990c872c519dca80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB2 10292 bytes

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