Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66a9ae94c5c1ad7…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 07:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0a7619ad62b2dc58db223a45cd81cd8 SHA-1: cf83f8feb47e632a3c8b40489182020652085964 SHA-256: f66a9ae94c5c1ad77787dc66e56a2f6c715dd9c423cbeea046ba2aa23456368d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to Shopify-hosted PDFs. The ML classifier also strongly indicated maliciousness. The embedded document body text, though partially corrupted, contains the same query parameters as the malicious URL, suggesting a lure related to fitness equipment. The primary attack pattern involves redirecting users to potentially harmful content via a link farm.

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=vision+fitness+x61007+elliptical
    • https://cdn.shopify.com/s/files/1/0429/9603/9833/files/98765256693.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/xepipoxusozaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/20602929096.pdf
    • https://cdn.shopify.com/s/files/1/0448/9238/9531/files/dossier_aide_au_logement_caf.pdf
    • https://static.usrfiles.com/ugd/585b1d_db11309533be40868616dfd96227af93.pdf
    • https://static.usrfiles.com/ugd/8e1900_65bef505eed846b4bf3650cb22e7f31e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfa4bfd4d8014aec97212927136faeb3.pdf
    • https://static.usrfiles.com/ugd/24853a_3bbdd5703be24013a42c947270538158.pdf
    • https://static.usrfiles.com/ugd/271e65_79e1649b7e9a436a8274784fc337d124.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1170fe5bb9b42beaf18c4ff951fc045.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/16943327300.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4665/files/65435501424.pdf
    • https://cdn.shopify.com/s/files/1/0431/4641/2188/files/curse_of_the_crimson_throne_anniversary_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/american_english_file_starter.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/usu_comd_3400_final_exam.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_off00005d65.bin
8a2109d1a4bfd1a155f3af891b7f79f381572bc24dcd6add910fe25cdff7e8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D65 5372 bytes
font_01_sfnt_off00006fd3.bin
110b29635ea060687fe03145114da53aec82638a663eb33dd1462705bf9cf070
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD3 10392 bytes