Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cdb4ef6023e1c6…

MALICIOUS

PDF

41.7 KB Created: 2020-08-28 21:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56e507bb9b4d4370068029b53b9e1a2 SHA-1: b044ab1742dbd26b260adf6cd33296448a5ac4ce SHA-256: e0cdb4ef6023e1c6d9f64931ede72e0f73bc19b4ed34579d07cf53c243e7919e
152 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.cc, disguised as a search result for 'Sherlock Holmes' content. It also features a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead the user to a harmful destination.

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.cc/wix?keyword=sherlock+holmes+altyaz%25C4%25B1+indir
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/58757614447.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/black_woman_names.pdf
    • https://cdn.shopify.com/s/files/1/0448/4962/7298/files/rosavoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/9884/0995/files/reading_comprehension_worksheets_for_13_year_olds.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/asme_y14._5_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/55733319210.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/vigefujoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5397/files/31819857906.pdf
    • https://static.usrfiles.com/ugd/b8c837_052f2125847e49058c83956fdea2c9cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_4eff25d7850a40f7b91869aedce118a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1dbbfb8f8a042a18d05d0f8565bf543.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdc77f2aa0844d95be48d2cfbe874bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c03b92a567b24e02867ff4b7cdb0cf4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a498d95f1c549b0a84515fce544a631.pdf
    • https://static.usrfiles.com/ugd/b8c837_06726444992e4d47ac4fef5d33b314e5.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_off00004fe0.bin
b15b9a927867e993d6639e9079940d1d28f24e77a4d5fd2970446ed705ae1bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE0 5532 bytes
font_01_sfnt_off0000627f.bin
be0cb5b5633f36d61b2c1251a218b137e9defc321a6add9a60b099ad06445eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627F 6452 bytes
font_02_sfnt_off00007378.bin
bb0a51ba7fbf24356370896d199aa8ebc37e8d85dd5f444b52263e69f4ae5822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 11272 bytes

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