Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8f1f020b4b8772…

MALICIOUS

PDF

43.9 KB Created: 2020-08-22 22:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47a7833dd01e5b5c2b76f66deed81547 SHA-1: 2448d79091a7eda94af55fd50e5f94625ca2de82 SHA-256: 8e8f1f020b4b877278746b7929c20202d3eb53446f2e8d5ba5903f3215e08beb
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO link farming or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=segment+addition+postulate+practice+answer+key'. The document body, though heavily obfuscated, contains text related to 'segment addition postulate practice answer key', suggesting a lure to trick users into clicking the malicious links.

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=segment+addition+postulate+practice+answer+key
    • http://files.playfulwonders.com/uploads/1/3/0/7/130739916/gefufozeti_marulurazoki_josiridanosef_fuxoriva.pdf
    • http://jozifo.maci-mcs.org/uploads/1/3/1/6/131606490/kidafixilapaje.pdf
    • http://ruweworev.worldswarmestsocks.com/uploads/1/3/2/6/132681579/ditasiwiwodirepona.pdf
    • https://cdn.shopify.com/s/files/1/0437/1405/2247/files/descargar_caballo_de_troya_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/gamujatatajevexevimu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4734/files/jadipevidixomitonojuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/tefulinedubolivutin.pdf
    • https://cdn.shopify.com/s/files/1/0444/3661/9431/files/48881594767.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5961/files/vilamera.pdf
    • https://cdn.shopify.com/s/files/1/0449/5589/3928/files/comprehensive_mathematics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/jevipifugalibewivemoso.pdf
    • https://cdn.shopify.com/s/files/1/0440/2744/5413/files/67521404574.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/kefivaluxerazazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/pharmacy_dilutions_worksheet.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_off00006ce5.bin
d0e8be46629d690601b3b27b8edd40a3e2eb345a74ccfc13940641d746d99cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE5 5756 bytes
font_01_sfnt_off0000807b.bin
8388da576105559a6aeeb65ffd10b06d1a8ceca1fbcf8c59f5f1d5eb46970465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807B 9992 bytes

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