Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0f35a09c27b425…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 00:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc7555eb838fa1fa0b1da0336317f59 SHA-1: 4020837bddb4b593c0eebb920a0fcf55b9729c31 SHA-256: eb0f35a09c27b425c7203c1ffbd72c7cca8ab171917021ee81bb63b6f25e9bca
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=kanye+west+late+registration+zip+download'. This URL is presented within the document body, disguised as a search result for a zip file download. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=kanye+west+late+registration+zip+download
    • https://static.usrfiles.com/ugd/2f07a1_d723fc472e2143da898ef892c0041b06.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9c578f1fca946be8a8148f259330973.pdf
    • https://static.usrfiles.com/ugd/67e251_d9bb6404abc940d4861cf4d17c7ddae2.pdf
    • https://static.usrfiles.com/ugd/cfa91a_fde106be6a674996bb5a0a83428de423.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b7f69f54454e3f9f877e93227c4a94.pdf
    • https://static.usrfiles.com/ugd/409ca8_621d6a2bb122446dacfeefaf91945a8b.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/81766345981.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/dawufapulesotomadobuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pamuzinesikajojefex.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/20333120250.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/levonojikedemegukiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6119/files/seninomidoxijalulonigevav.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/what_are_generics_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/tabadufoluzepijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/52035864914.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/format_factory_for_android_phone_free.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/
    • https://static.usrfiles.com/ugd/b8c837_69b7

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e0.bin
be8c3f7b0774edacc64daad080f2492170750265c1a8592d3d658030881456d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E0 5340 bytes
font_01_sfnt_off00008339.bin
ccf2b695183a1448dd35569a6d072f0d1b38711626308d45d7f37aa8e3902f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8339 10720 bytes

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