Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b6aa9ce7bf70e7…

MALICIOUS

PDF

49.4 KB Created: 2020-09-01 18:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cca2a932a50c30dd3c51c1be6bea5f1b SHA-1: 1c0be8a486d149076ff08b34a28093d48a5a3e61 SHA-256: 42b6aa9ce7bf70e77e08c2e2260658d841adeaf67d04750f52eb9c1bae249083
152 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains the search term 'pe foam sheet near me' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which point to static.usrfiles.com, likely part of a link farm to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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.me/wix?keyword=pe+foam+sheet+near+me
    • https://static.usrfiles.com/ugd/b8c837_586882f55bae49f7be74bbd8bae9132f.pdf
    • https://static.usrfiles.com/ugd/5926b4_adc152f53ad7439f92a8abc951f45962.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_293ef79b3edf401e92bb753237e60b7d.pdf
    • https://static.usrfiles.com/ugd/c068f8_fa77bb9903204b36887f3b74d0695b3e.pdf
    • https://static.usrfiles.com/ugd/405339_1c7e7a3dfc9b49a49b3df1f587950401.pdf
    • https://static.usrfiles.com/ugd/b9801a_e8d1205ecf224d0d92d307b795abb813.pdf
    • https://static.usrfiles.com/ugd/b8c837_74ef12afff234ccaae618b61aebf2bca.pdf
    • https://static.usrfiles.com/ugd/8acad3_ebd8add97b244814a22fdb0dcba2b091.pdf
    • https://static.usrfiles.com/ugd/b5472a_6e51dcb21b384e3a9431a864ba39b963.pdf
    • https://static.usrfiles.com/ugd/b8c837_302226b5e6034eb886c74c9c2ee793e4.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/lujop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/49676994267.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/bikowomuzixe.pdf
    • https://cdn.shopify.com/s/files/1/0464/7256/0790/files/build_a_bear_online_collector_s_guide.pdf
    • https://static.usrfiles.com/ugd/221f3a_f7ccd03a89b54353ba5b9b4432f54978.pdf
    • https://static.usrfiles.com/ugd/8b4172_28393e68112e4ae48d3bb963ef94138c.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
stream_005_off000099e6.bin
882b561cba55f0d18fbb41885adaa526c2efca57577155f5b9757e388cea6f12		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x99E6 19232 bytes
font_00_sfnt_off00006333.bin
0e1c0868e816548c48452753270beeba95a282495bc30a5a55101154538a2b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6333 4976 bytes
font_01_sfnt_off000073f6.bin
b8ff8642a08581941ef686d9b6045f19813b336d35ffc0d0c54eda875655ce3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 11520 bytes

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