Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04f07f4c30bbe21…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 05:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe75d58b60c0185c66d0c6b4f74adb1 SHA-1: 2c6ec075c0c888293177ebd64cac2e8c68df34c6 SHA-256: b04f07f4c30bbe213217409821047c4a65e5b0df72885dc106a4308dc3db209a
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=fire+emblem+path+of+radiance+hard+mo'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but contains the same redirector URL and several benign-looking Shopify URLs.

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=fire+emblem+path+of+radiance+hard+mo
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/catechism_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/4478/9653/files/nebizunavekorepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/3268756397.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/pulmonary_hypertension_classification_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/23427389749.pdf
    • https://cdn.shopify.com/s/files/1/0463/1127/6706/files/read_message_to_the_blackman_in_america_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/ralowapapurasexez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9403/9975/files/inferring_meaning_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/vofiz.pdf
    • https://static.usrfiles.com/ugd/e02969_8219e931bf674922b652d34822c049b1.pdf
    • https://static.usrfiles.com/ugd/e02969_1a9ec1b0f527480f96dbefa3ff18c05d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1450b556a9764b1781a56517d60c6ebc.pdf
    • https://static.usrfiles.com/ugd/c63dba_b52e5c67f4634db194cc754ca42bbd91.pdf
    • https://static.usrfiles.com/ugd/105a8c_00f0b5f1f8d54caa8d0a5e8a9d7ff3fa.pdf
    • https://static.usrfiles.com/ugd/f65518_bdf9364c9aef45c68cbbc5f109bf605b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae215fcc8554218abf0cf5653c3ead0.pdf
    • https://static.usrfiles.com/ugd/756799_8698a1990e8b42a6929280bb5a48416f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccb8a125ba5a459f8f601b6bfbbbc0f4.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_off00007c20.bin
7cf0cb9bce3a94889d085f1795ff1ac83ad8ec6fe669912cb886f5c61a2eaa7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 5312 bytes
font_01_sfnt_off00008df8.bin
36bafdc61a77d6776d9f6928ece83bb4263d47661c9d07f452773c6a543bfc90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF8 10804 bytes

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