Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb7900c5e554291…

MALICIOUS

PDF

65.6 KB Created: 2020-08-08 18:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbc9be869f4666c92631327acb6dc4ce SHA-1: 38a6426dae4e1a9dbaee0b4b433ef458cd9bdb7b SHA-256: ecb7900c5e55429129aca9fa9d60fd9261f31f8a0b67502f8e110b07af4aeba2
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'druid handbook 2e pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious redirection. The heuristic firings strongly indicate malicious redirection and a link farm strategy. No scripts were extracted from this sample.

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/wb?keyword=druid%20handbook%202e%20pdf
    • http://files.stephencallis.org/uploads/1/3/1/3/131381376/jituxuso-venirelosiraze-rarekakofe-bodajik.pdf
    • http://files.saraspondayoga.com/uploads/1/3/2/6/132681772/riros_regojetanovij.pdf
    • http://wobub.ezrabenus.com/uploads/1/3/1/3/131398560/wujizowatakif-dogarimapaguxe-tifikeruz-lizunul.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/xogadeturotaxapunosimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/rejabegosuronorizosak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/zip_codes_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/9825113532.pdf
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/kukuzenodejuwenugomupeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5485/7369/files/81547504478.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/english_albanian_dictionary_of_idioms.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/9999052261.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/onn_mini_stereo_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/niwotomazegavufazosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/fakeguluxosolososa.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4968/files/30081092774.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_off0000c4df.bin
0b780952a05ea19aab34a0f8410c929ef3a3fd3cf9c6b82688bb1f78bdb7be94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 5252 bytes
font_01_sfnt_off0000d6b8.bin
141ca632cdb3e922952d82fe96d52708ac1a114da767e566c5745328e44b6d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10240 bytes

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