Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8dc0800eaaf9b7…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 04:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d38dc0ee402e93ff8420388deff31306 SHA-1: e9ea079621586072cb35576132f6a3d1f834d494 SHA-256: da8dc0800eaaf9b711efe8dea1de9127e99ec6a53ecd20c53abf78f564bb6362
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious nature of this PDF.

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=man+2.+0+engineering+the+alpha+pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/castrol_atf_dex_iii.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/dufuvib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/leblond_regal_lathe_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_7642f6ffc28645288c5cd434533edc10.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b1b134a029a4bcb96da76c7124c2d58.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/autocad_commands_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/43725787356.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/food_quality_assurance_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/25412045719.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/kenavi.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_off00005fb3.bin
18a6c4db3ea3dce7fb5e6cc1a935a7c92a6e45acbb77a2f620a0104f00032dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB3 5436 bytes
font_01_sfnt_off00007234.bin
47bc5fafc55473eb3a503c008d9761fb86d5d85bcf557c8d44de4a4c43ed563c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7234 10468 bytes

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