Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f0d4b431a58829…

MALICIOUS

PDF

65.3 KB Created: 2020-08-26 17:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93bd48da52062277a0383f3b3950b4c SHA-1: 36af456d322ed782a80d979c967b44df7775431c SHA-256: 83f0d4b431a58829c82c8ccdbafea1fa5e465cf275d2659187b1940a52749aed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination or serve malicious content. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, suggesting an attempt to manipulate search engine rankings or distribute malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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=diagrama+de+conector+obd2
    • http://files.artemleaders.com/uploads/1/3/0/8/130815437/56e41c74761eb59.pdf
    • http://files.wisteriasage.com/uploads/1/3/1/1/131163718/c599b09f19a7e.pdf
    • http://toleviba.takadventures.com/uploads/1/3/2/7/132710589/jorupagiromemofegoxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/bomisufasatozebudumitude.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/99066899453.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/mejores_aplicaciones_android_tv_box_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4866/files/31765281327.pdf
    • https://cdn.shopify.com/s/files/1/0461/5376/0931/files/arcane_legends_new_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/19819138080.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/92074541934.pdf
    • https://cdn.shopify.com/s/files/1/0440/5487/2214/files/82314151516.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/steam_api._dll_windows_7_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/13988698278.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/speet_test_telin.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/vifotutugigepakubuzej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/robert_half_salary_guide.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_off0000be57.bin
14e130ec268540181ec50731ae9dc71b5b08226a08a5497767768300a4dfe0b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 5320 bytes
font_01_sfnt_off0000d055.bin
a746c2b9c24bb7866094905628d912b37f5a71baebafc5c66799a6006bcb6752		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 11712 bytes

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