Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb59f4170c3b4e67…

MALICIOUS

PDF

41.5 KB Created: 2020-08-08 16:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80e6e42f890a079273d2b30340e7d014 SHA-1: 4ab806b991f7cb3019527ed25b0aba1272f982d0 SHA-256: cb59f4170c3b4e67f97fae5e111b0786a29e76d28ee130f8989e982a9148a4a4
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'https://ttraff.ru/pify?keyword=linux+command+line+pdf+to+jpg'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, also contains this URL, suggesting it's part of a lure to trick users into clicking it. The presence of a large number of external links also points towards a link farm or SEO poisoning tactic.

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=linux+command+line+pdf+to+jpg
    • http://files.xvmcnorcal.com/uploads/1/3/2/8/132815178/7338966.pdf
    • http://files.amberaasman.ca/uploads/1/3/1/4/131437615/56856.pdf
    • http://files.allamericanveteransmc.org/uploads/1/3/2/7/132740249/4a44192f18c442.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/nufexilixikaniba.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/valuwil.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0116/files/xofazizibasibosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/kawemoleg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/classification_of_african_languages.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/7975943781.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/python_cut_off_decimal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/zaxizipalovine.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/66269550207.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.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_off00006229.bin
65e16f68c0817c8cce9e5044b55d33a9c26f52704a5cc0b22649885b9a58b985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 5288 bytes
font_01_sfnt_off0000742b.bin
6c2c2fb23bf9a6fb330d71920e99cae9556257d72a95497ff9c12a0ec0f9e013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 10896 bytes

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