Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421d9a4d58dec54…

MALICIOUS

PDF

45.1 KB Created: 2020-08-14 00:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bb651f3ac7e36a8711c48fc3a564b24 SHA-1: 3766ec1c5cc037360d7680b71c4aa815c1f433bd SHA-256: d421d9a4d58dec5417f90f5959f223ef0620b37d9bb8fb8e588b5d7f310906f2
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one that redirects to known malicious infrastructure via 'ttraff.com'. The document body, though heavily obfuscated, contains text referencing a 'balance sheet sample problem' and the malicious URL. This suggests a social engineering lure to trick users into clicking the link, likely leading to further malware download or a phishing site.

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=balance+sheet+sample+problem
    • http://files.jayfeenstraphotography.com/uploads/1/3/1/4/131437225/6841001.pdf
    • http://files.kidscottagekg.com/uploads/1/3/0/8/130814605/40b99.pdf
    • http://files.nathanwilks.com/uploads/1/3/0/7/130776745/jefoxus.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/dowuwerorerejeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/18251152735.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/guwajojidopixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/fakinisukezifezitos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0859/7927/files/acr_practice_guidelines_cardiac_mri.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/max_payne_3_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44484222312.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/tavokizitemedijufatemosa.pdf
    • https://cdn.shopify.com/s/files/1/0447/0230/2362/files/30216244899.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/95132596228.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/atlas_map_2020.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_off000071ac.bin
33a490a9e7802de1d909e1f9cf8afa48a3f0bab7e7c9da156b74a14df0b1eb87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AC 5360 bytes
font_01_sfnt_off000083ac.bin
2e70386107fbd90a9abbf143a1ba1e682e5ca25b87378d0bad0d7e3166315406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83AC 10568 bytes

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