Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c094de0bdffd25…

MALICIOUS

PDF

49.7 KB Created: 2020-09-02 13:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecaf5c84b3a2eb4bb87bc892cc614e88 SHA-1: a3d464a92ae0dd0a50df661394f04f3a91e11cc0 SHA-256: 37c094de0bdffd258ffa41712e225d0a4a0a73976aee82c06bc79d07b27d76c0
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.com, which is disguised as 'online expense report software'. The document also features a large number of external PDF links, many hosted on Shopify and static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains multiple embedded URLs.

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.com/wix?keyword=online+expense+report+software
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/66836429814.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/tuvobilerizonezujowetexiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1877/8781/files/16101015715.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5654/files/zetelew.pdf
    • https://static.usrfiles.com/ugd/b91566_2a83f9201c854471840bd0653d540e2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e7c60119e7a47c4bb0677d44fedcb88.pdf
    • https://static.usrfiles.com/ugd/83f04e_6a77c00f0d4b4525b9f2bd5e9a51c836.pdf
    • https://static.usrfiles.com/ugd/b8c837_69864e2194be4bcab8c9cf96bf64d9ec.pdf
    • https://static.usrfiles.com/ugd/9e41f0_6be24ea2dbe5487ab93ebd92f764e311.pdf
    • https://static.usrfiles.com/ugd/0aab01_9cd17baa81af47e3be8f7d7c9d413566.pdf
    • https://static.usrfiles.com/ugd/3bf302_1468c516ab2b4605847eadd5ea21bf67.pdf
    • https://static.usrfiles.com/ugd/b52961_f1f726159bfd4ca1ab53794545a19ce5.pdf
    • https://static.usrfiles.com/ugd/33c377_e44be7d164174dd3b115d3046de64877.pdf
    • https://static.usrfiles.com/ugd/0a593f_4ae262465f204916a33d6666bb8b3d7a.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_dd460ec1b1b54b5abef52e20301ec24a.pdf
    • https://static.usrfiles.com/ugd/89064d_e9a5bb701ac140728453706aa7be8b92.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a0.bin
958e08940f37063c0f6ef27e5ae9e2217327772cec6a0e0da03ffbb687c60714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 4872 bytes
font_01_sfnt_off00008946.bin
829526d83eb7f7c596193d1a0f9fd4fa220c018b340ef875708c344b11b5c84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8946 10108 bytes
font_02_sfnt_off0000abeb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABEB 4324 bytes

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