Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d3d10a36eccfba…

MALICIOUS

PDF

41.5 KB Created: 2020-08-16 18:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93c63292b773f9684ba70b7c17e7850 SHA-1: 314a6ecb0b4495c734015b7ce2385dd442293186 SHA-256: 90d3d10a36eccfba53697ec576091c1264ee9c6c6ad41f68553d48833e8f1e9d
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/pify?keyword=costco+charisma+twin+sheets'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL indicates an attempt to lure the user to a harmful site.

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/pify?keyword=costco+charisma+twin+sheets
    • http://files.khalillezzaik.com/uploads/1/3/1/4/131453170/pilukipogi.pdf
    • http://files.dehrtocare.ca/uploads/1/3/0/8/130814633/xokonugan_pinaxufufaxiwa_fanajimax_bafug.pdf
    • http://files.jllongbooks.com/uploads/1/3/0/7/130739525/pubuvo-gikogiwe-kamerikasoge-lukipomefeludi.pdf
    • http://files.nightingaleledsolutions.com/uploads/1/3/1/3/131379928/9d6eda7d12a8640.pdf
    • https://cdn.shopify.com/s/files/1/0454/3473/2712/files/wepufozulizalofuninitemod.pdf
    • https://cdn.shopify.com/s/files/1/0432/1922/2687/files/sql_query_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/91048799747.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1421/files/tadawarezawovowav.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/45693315540.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/calendar_problems_aptitude.pdf
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/52852876209.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/xusamilenugekedavogabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/chevy_tahoe_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/2108/6365/files/mozabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5835/6639/files/33636922058.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_off00004ee4.bin
1882f3f994732505b68e572b95b9d6eaba8600b11f0de35e0f251f9c029d9a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE4 5004 bytes
font_01_sfnt_off00005fd2.bin
f4b873a0dd536785ac416348606fc7ddad455f9a505fbe0656cccf9d2c4ee348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD2 10340 bytes
font_02_sfnt_off00008351.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 16312 bytes

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