Malicious PDF — malware analysis report

Static analysis result for SHA-256 2078e36a9e3d8076…

MALICIOUS

PDF

42.7 KB Created: 2020-08-22 02:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f156634e19c987fbb95d5cb37309afc8 SHA-1: 6a461948e4164cc5b40a767472968db35fe1b8fe SHA-256: 2078e36a9e3d8076d231ac7f7ca0693ee130951cf6603b43d73eec256d90d505
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is disguised as information about a playing cards game. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several other URLs hosted on cdn.shopify.com, likely as part of a link farm to improve SEO for the malicious content.

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/pify?keyword=playing+cards+game+information
    • http://files.fdnholisticwellness.com/uploads/1/3/1/4/131412181/81f35aca4d0d9.pdf
    • https://cdn.shopify.com/s/files/1/0450/8424/6168/files/20644626417.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/15788011717.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/gixuwopoxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/zidetufomasutowagisadaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6308/2146/files/72563883511.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/pidixutoniwimosoxobozo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/62128520296.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/8807418717.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/77214252917.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_off00005bf0.bin
a2a1bfea4e59627af399d2a2fdab9caedfa253531dfc2d4526ac42b23ef6bc3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF0 5232 bytes
font_01_sfnt_off00006d9f.bin
9a5da6965a925822311df29cd2cf54e8392bb9c03aa516102f586e7f3e67789a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9F 10208 bytes
font_02_sfnt_off00009085.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9085 4324 bytes

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