Malicious PDF — malware analysis report

Static analysis result for SHA-256 d272a5a11d02d1c2…

MALICIOUS

PDF

44.9 KB Created: 2020-07-25 04:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a62c6caf27bb0e2f4ade496fd706aac7 SHA-1: 07618c99a3d118b0cfdee5012ad68a9e27c2895a SHA-256: d272a5a11d02d1c278ad9344b5b3a0ccaabdf42aabe81d417ccbedfa272a5e9b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link farm with numerous embedded URLs, including a primary redirector to ttraff.com. The document body, though partially corrupted, suggests a lure related to 'rational function graph questions and answers'. The heuristics indicate the PDF links to known malicious redirector infrastructure and hosts a large number of external PDF links, characteristic of SEO poisoning or link farm abuse. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=rational+function+graph+questions+and+answers
    • http://files.twistedclovertraining.com/uploads/1/3/0/8/130814115/e1cbc8d214ec.pdf
    • http://files.joeystupor.com/uploads/1/3/0/7/130739532/fb4dec97b826e.pdf
    • http://files.danielleposin.com/uploads/1/3/2/6/132682070/nadutebino_jiriwefevev_jofubabiwuwivi_moguwomixupani.pdf
    • http://files.ict-makers.com/uploads/1/3/1/8/131871642/adf3c.pdf
    • http://files.earthspiritpath.org/uploads/1/3/2/7/132740270/2311508.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7447/files/lopovopofaruwubapigejeti.pdf
    • https://cdn.shopify.com/s/files/1/0432/8082/6532/files/ninunukisumop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/nemiparuwuginotapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/21462239466.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vepotarinaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/33633695234.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/2118197387.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/51042604770.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_off000068a6.bin
3f0bf1d392eb44198234b3460e764c0f5050e19335fd0f538ff5ecef1a6060d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 5524 bytes
font_01_sfnt_off00007b71.bin
f7ed4002916d242f0e6997b9db12990bf586a9f44e6b07f833ce6adb8cd34262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B71 13476 bytes

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