Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ddca3edef56295…

MALICIOUS

PDF

45.8 KB Created: 2020-08-18 18:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2ab001853e05de096c652970ed2951 SHA-1: 3e45f1afcf4dce2933bbc355091642d31ea6b3b6 SHA-256: a9ddca3edef56295cec66c1f9888baeaa6b0a78f7409cee0f34162805027a8f6
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=arduino+servo+projects+pdf', suggesting a lure to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=arduino+servo+projects+pdf
    • http://files.thesanctuaryatmn.com/uploads/1/3/1/8/131856184/d83262d07.pdf
    • http://vavakoj.jamiejordansings.com/uploads/1/3/0/9/130969352/bf9cba334e14.pdf
    • http://files.beckytiernan.com/uploads/1/3/1/0/131070434/satalejobejefakisu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/98722899360.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/pokemon_battle_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/medical_fitness_certificate_kerala.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/39321335262.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2163/files/elementary_stats_triola.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/veterinary_cytology.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/brahmani_mata_bhajan.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/movizubedipilun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/56060966170.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/linuxisuzanidenov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/wolasibogufulewuwiladavaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/648287677.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/68432152397.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/competitive_intelligence_report_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006232.bin
9078ec79c168dd063960759008860aa6489d95175b3c0e13427a88f8c927e08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6232 4912 bytes
font_01_sfnt_off000072f7.bin
e0838d55cc3708fe282536dfb091b121296adfb7ca5192fc5197cbf13f63501f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F7 12756 bytes
font_02_sfnt_off00009beb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEB 4324 bytes

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