Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7d5762861691ae…

MALICIOUS

PDF

83.3 KB Created: 2020-08-31 11:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d4ed5d72f3640570b8c47ce1bce156 SHA-1: 492a9de73763c3ee30a8da0cbf4716e4a18799ba SHA-256: 2f7d5762861691ae6fb93de85a2a5c36c9f51105acac8a00733c74460a1e0beb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness. No scripts were extracted, and the document body is heavily obfuscated.

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=combine+like+terms+solving+equations
    • https://static.usrfiles.com/ugd/32777b_41d6a458c2a648f0a78bc9134746f099.pdf
    • https://static.usrfiles.com/ugd/696b8a_940fa0d17df14c0ab372cdec351bda3e.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_08a93615502244d083e58d7e17bf29c1.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/30940549125.pdf
    • https://cdn.shopify.com/s/files/1/0434/1959/9004/files/wancle_sous_vide_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/tosamizimufatatu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/direct_expenses_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/4013/5575/files/15894179398.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/37897553034.pdf
    • https://static.usrfiles.com/ugd/b8c837_0430d59fc6b84d73877ca041e394734c.pdf
    • https://static.usrfiles.com/ugd/fe83c3_654a610060044b3e8493430668847e2d.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_off0001087f.bin
ed32d5e405d81eed5ef3c2fa3618c0f44e8b0e2632be0cc0cb1db2d775b42446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 5300 bytes
font_01_sfnt_off00011a6f.bin
02e1c449b37002414aaa3dbc1316826aab05040050a7f552a08a329ad9ed2892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 11104 bytes

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