Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9839973e819f164…

MALICIOUS

PDF

45.0 KB Created: 2020-08-22 11:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d8368d1ea5cc23711577c02d8c8f27 SHA-1: 34699075b1af07d73110e0511e8f256583e892e4 SHA-256: d9839973e819f164ad03646abd0152c9d3601e27a67d4575d40b0f7a37fe170e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm hosted on Shopify, designed to obscure the ultimate destination. One of the primary links, 'https://ttraff.ru/pify?keyword=sing+shout+alleluia+pdf', is flagged as a malicious redirector. The document body itself contains obfuscated text and the URL 'https://ttraff.ru/pify?keyword=sing+shout+alleluia+pdf', suggesting the intent is to redirect users to malicious content.

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=sing+shout+alleluia+pdf
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdf
    • http://files.argos101media.com/uploads/1/3/2/6/132696077/xuwetus.pdf
    • http://rewilul.wstcharity.com/uploads/1/3/1/6/131606295/sureme_xekoz_tufigunonoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/jomat.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/tezefesokewakolifofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7883/4583/files/agricultural_extension_and_rural_development.pdf
    • https://cdn.shopify.com/s/files/1/0429/0723/8567/files/xevopuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/87712380552.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/gitegigutiverimonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/ketumawiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/1264262209.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/suxajimojepibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/24591313813.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/67689958011.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/apostila_para_auditor_fiscal_da_receita_federal.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_off00006555.bin
9c1feca71d7d772e5a2ac2ac49eb9d5d46298dea4699e89d39fe8eb91bf8a02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 3772 bytes
font_01_sfnt_off0000728e.bin
6051289822ef7043cd0c0fca441a08ff7128975c89b7c7012e191e6499c51983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 5312 bytes
font_02_sfnt_off00008499.bin
17922d1884e437f539c64fbb7dcdd03c3d3b88994cc946427908041e63175ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8499 10000 bytes

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