Malicious PDF — malware analysis report

Static analysis result for SHA-256 d964b1135e1db86b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d647fd375ee077b7af52a69fcb436d42 SHA-1: fb9bb97e4a1368fe2fa79f391a72194d6ed1070c SHA-256: d964b1135e1db86b1483112031116a9a7629bc35be92a3a8427bdf76d2f79d9a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Adobe premiere portable download' and the malicious URL, suggesting a lure for software downloads. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=adobe+premiere+portable+download
    • https://cdn.shopify.com/s/files/1/0447/5479/6698/files/zesofuvoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/adobe_reader_9_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1958/files/subujejodezimizibaganute.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/xojagonuxarataxosu.pdf
    • https://cdn.shopify.com/s/files/1/0457/3482/2044/files/28605928051.pdf
    • https://cdn.shopify.com/s/files/1/0439/6508/7902/files/pixitotaguwipuju.pdf
    • https://static.usrfiles.com/ugd/8de238_e0bde91da56a4efd988833a90bfda709.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4815c83b5ea43cca81076e6b930a981.pdf
    • https://static.usrfiles.com/ugd/6116da_ff3f2419ce9547f28246398160444c25.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2a34f99e45c4631a1cac9d382272220.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0183fa233b04eaba1a5c57c03c6be3f.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_off000075f5.bin
1af8e451a00eff758ee7d27d0ef32a7d19e814db01677d1d152d77068a0efdf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F5 5148 bytes
font_01_sfnt_off0000876c.bin
64f74d304ac9b2dd9f67ba7757889f6324c575871261182459b380a36ffad6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 10700 bytes

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