Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ebeab54796a90d…

MALICIOUS

PDF

49.5 KB Created: 2020-08-08 11:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c99f2ec3a7eab7be955a18940b6613 SHA-1: 25016f496b92c9236434ba8330a79185f9344a9e SHA-256: a7ebeab54796a90daeb81a43ad9535fedab5fd58d27a31f36becdd315f75d46c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link that points to 'ttraff.ru', which is flagged as malicious. The document body and embedded links suggest a lure related to 'Infosys online aptitude test questions and answers pdf' to entice users to click the malicious link. The PDF also contains a large number of external links, many of which point to Shopify domains, suggesting a link farm for SEO manipulation to distribute the malicious content.

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=infosys+online+aptitude+test+questions+and+answers+pdf
    • http://files.beasleyceramics.com/uploads/1/3/1/1/131164275/ketub.pdf
    • http://files.iguanaclothing.com/uploads/1/3/1/4/131437464/nofemevirim.pdf
    • http://files.brixhamswalkoffame.com/uploads/1/3/1/4/131483083/fae329e8a0e324.pdf
    • https://cdn.shopify.com/s/files/1/0437/9954/3970/files/gebisetosevisukibebefowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/50031816198.pdf
    • https://cdn.shopify.com/s/files/1/0434/8284/1250/files/93684959698.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdf
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/76104597358.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/mefekumakepubiro.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/hotpoint_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/architectural_perspective_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/84715085205.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0394/files/amazon_kdp_account.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006997.bin
12b7e6330fa6b4d61f1ad04cb14c05ec60dbd06853b7a0807b1e6d452001cdb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6997 5172 bytes
font_01_sfnt_off00007b44.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B44 2268 bytes
font_02_sfnt_off00008554.bin
afdb7a4df20a9b38ac34a2bd8c851b7c3b2e6cdd7e67ff65e2c4aa1225142c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8554 11016 bytes
font_03_sfnt_off0000aa6c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA6C 4324 bytes

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