Malicious PDF — malware analysis report

Static analysis result for SHA-256 7857c3d89cbca858…

MALICIOUS

PDF

47.2 KB Created: 2020-08-12 04:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f138575e6fa393cbfdf8f17203b218be SHA-1: e2a10d0c16e1fdba2292eee8593d49b863504fcc SHA-256: 7857c3d89cbca858d596bf68338bfa66a75ab49867efcdec9e9b1a4be2b7a969
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with the primary malicious redirector being https://ttraff.ru/pify?keyword=benchmarking+notes+pdf. This suggests the document is designed to lure users into clicking malicious links, likely leading to further compromise.

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=benchmarking+notes+pdf
    • http://files.madronacompany.com/uploads/1/3/1/4/131410736/gafidudanimetig.pdf
    • http://files.hlleathercompany.com/uploads/1/3/2/7/132710717/3853406.pdf
    • http://files.flowergirlkauai.com/uploads/1/3/2/6/132682338/vuxasigomu.pdf
    • http://files.4lee.net/uploads/1/3/2/6/132680915/db86c39f.pdf
    • http://files.swolfephotography.com/uploads/1/3/0/7/130774965/mobunoboxeren.pdf
    • https://cdn.shopify.com/s/files/1/0451/0665/9493/files/pdf_markup_app_surface_pro.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/vapesazis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/zawosovusuziwiruwunile.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/55788778978.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/mewevegazinerolek.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/faferobobuwuzimoweg.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/ramefajovulafuxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/bugunidomad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/advantages_of_lifi_technology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/44972143631.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/valuwil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/pavev.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_off000072c4.bin
2865e7baf948dad665c6444796ca384115bd4b2b4fd1fe86d29b5d3d3d6405bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C4 1604 bytes
font_01_sfnt_off00007ae7.bin
4061ff9850cf9822f63e50575341ec304cbfb4cc914e0ce22f856319e1f578a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE7 5648 bytes
font_02_sfnt_off00008de3.bin
659bcf8e4fa6904c6924d47d9e963147aef5d5545a73e0324462d26f658ffa8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE3 9796 bytes

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