Malicious PDF — malware analysis report

Static analysis result for SHA-256 432b4c1ebd5a9ec6…

MALICIOUS

PDF

48.0 KB Created: 2020-08-30 16:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce9ca9d9c667455d018d7c6cfa17052 SHA-1: 27c58bf090609990f5248d5d02edc7c8b2b56ee3 SHA-256: 432b4c1ebd5a9ec6815b0be4210b09aa7921cecf3a6750a4faa305e8abcbb1ea
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=custom+facerig+avatar, which is also listed as a malicious redirector. Additionally, the PDF contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt, with the primary malicious link being the ttraff.ru domain.

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=custom+facerig+avatar
    • https://static.usrfiles.com/ugd/b8c837_6797cc100474482bbaf7bc7ea767e960.pdf
    • https://static.usrfiles.com/ugd/804ff6_ded916c4ec8e42e3a8f89092b7495e5d.pdf
    • https://static.usrfiles.com/ugd/837d34_36fcb2a634664ef18b1f2e922b2686ab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/convert_seconds_to_hours.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/notasetafemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/30160611883.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/bimitasezofososibebamos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3822/9158/files/zabizebizuxefaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/6880369610.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/kazuti.pdf
    • https://static.usrfiles.com/ugd/57c819_77175cf313124124ab9348132ee3f370.pdf
    • https://static.usrfiles.com/ugd/ed64d2_fea8b1db63cb43489e5680b01d27e4b3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005649.bin
1e23c5b35149eb533ab29e2d3facce9403875bf0f6aa33672bdb656153e28f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5649 4832 bytes
font_01_sfnt_off0000673e.bin
fac2e1047bfd7e1af652c31d558b983f949addd71b55fe6661e2b73ec013b64a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 5132 bytes
font_02_sfnt_off000078a5.bin
7ca60493e9e76ace5b532f84d8460797968f01ce4c7f6e40a32799cb6476d770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A5 10656 bytes
font_03_sfnt_off00009d43.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D43 16376 bytes

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