Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74c625b054255c8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 23:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13244f152513799a8128dde44ac6e24d SHA-1: 69c03a9014b9739223f5230030feb8b35366e24c SHA-256: a74c625b054255c8932cdffc85ee09f341b1121b8e9b93cff33ff1c25fa310dc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=sugar+man+winner+eng+sub+full'. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body content is not readable text, making the primary attack vector the embedded malicious URL.

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=sugar+man+winner+eng+sub+full
    • https://static.usrfiles.com/ugd/b8c837_2968bec767fc414990ff7115e05a105f.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ac3770fcc0410eac93eacff9e17f07.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f9de99ca94e47239de65ce3fa4bfef4.pdf
    • https://static.usrfiles.com/ugd/89363e_3b0fa640b238441b91616f9329d87be7.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.pdf
    • https://cdn.shopify.com/s/files/1/0435/3032/2071/files/gonabidetobesaduk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/tegobijifalisonezatenuno.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6229/files/refefubizisutuwib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/5842604947.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sigizimozibamagazilezut.pdf
    • https://cdn.shopify.com/s/files/1/0466/4210/2437/files/pozuvezatugimikefilonon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5111/3887/files/76802529815.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/fubosumaviwawobuwedabolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2703/7336/files/61210644433.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_off0000513f.bin
e3554eabbd4d2312a50802ad8fbea1e7a2f09f57ac8805d3ac0b605046c6a8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x513F 3408 bytes
font_01_sfnt_off00005d8e.bin
c5871699f55be2246135f6aec56f1aad982b9e028d58ebf90159e97caf871e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8E 5420 bytes
font_02_sfnt_off00006ff4.bin
ae4b4dea34f4a74321a3df7ac3a0c8de44e3e424636a95ff46c94f202bf30458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF4 11384 bytes

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