Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52a957c7c4e5f57…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 018ad2bfbf8d5a7436aac556a5d47b0a SHA-1: 4da7c55a20cd5ac0bb8b934ea9cd64af0d018cd5 SHA-256: f52a957c7c4e5f579131f7ebee97be484510570d0ae85d83d53f443884d62f35
150 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=descargar+appcake+para+android'. This indicates the document's primary purpose is to redirect users to potentially harmful content, likely a scam or malware download. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=descargar+appcake+para+android
    • http://files.thehappyrootfamily.com/uploads/1/3/0/7/130776031/0399e182dd.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/dell_keyboard_kb212-_b.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/remomimesutorolibelaso.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/karukanidubiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/rigasimirisazibulaliluv.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/political_campaign_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/saroxevupekal.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/88801900924.pdf
    • https://cdn.shopify.com/s/files/1/0448/2659/1389/files/bar_interior_design.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/90013580916.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/compress_mac_without_losing_quality.pdf
    • https://cdn.shopify.com/s/files/1/0429/5091/8310/files/tupapotomilim.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_off00005d19.bin
bc0aae3ee70ae0822a08f551b288e1415d360c8d4c7a33039518adfa450eda17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D19 5272 bytes
font_01_sfnt_off00006f18.bin
bf94887308ba6f7fcfff94376abf9dbd6df3c1eacf6412953aa8c61370d7f164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F18 9944 bytes

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