Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd43173a06d9ee7b…

MALICIOUS

PDF

68.8 KB Created: 2020-07-12 23:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18f8866d10700a03ef4a58acb0044887 SHA-1: d7628cc7b6595b8c6de2f72696f0dbf0eaf7e52c SHA-256: dd43173a06d9ee7b5368d6dd6c87161107d6e618aa5d26aada07e6715e4b8605
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, designed to redirect users to external websites. One critical heuristic indicates that these links point to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a specific user-facing lure beyond the link farm itself.

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.cc/pify?keyword=autoportrait+artiste+contemporain
    • http://files.joeslodge.marketingfactorygroup.com/uploads/1/3/0/7/130739696/fisaduw-xidatejuwupadet-nopev.pdf
    • http://files.florablackettdesigns.com/uploads/1/3/1/0/131070692/b2a1bf87b3511.pdf
    • http://files.sandracrawford.com/uploads/1/3/1/3/131379608/afb4b40654.pdf
    • https://jadulotixen.files.wordpress.com/2020/07/rimipadokibelol.pdf
    • https://rafuzakaxoru.files.wordpress.com/2020/07/bumawokevivefop.pdf
    • https://wubegupo.files.wordpress.com/2020/06/10359097654.pdf
    • https://tozikoxe.files.wordpress.com/2020/07/lasukiluluf.pdf
    • https://regubixuxuv.files.wordpress.com/2020/07/50510605549.pdf
    • https://visazuk.files.wordpress.com/2020/06/85801748602.pdf
    • https://xedebixudo.files.wordpress.com/2020/06/xulonarexukuduzelimofoziw.pdf
    • https://jivaretorozu.files.wordpress.com/2020/07/wipamekazofejilunojufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.pdf
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/84176416793.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/10629482264.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5137558887.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/tubujafapetumux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.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_off0000cc04.bin
a2fd37c686edf3866bc008f7d5f1cf87a9c88e7dadf176990dd780e89a7eb1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 4916 bytes
font_01_sfnt_off0000dc9a.bin
a506748c0b4b4f57f1fbaf48ca87aeeeb79a97cd130959c62b236f65db76273d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 12680 bytes

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