Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b26af98179b79…

MALICIOUS

PDF

46.4 KB Created: 2020-08-23 16:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56ad62b9ab83be9e0ae80dc4021cb62 SHA-1: 09b197380e40e60c2a43bf0dcceea8aa4d073456 SHA-256: 834b26af98179b79b2064da9b803756d4e8ad683e0b9004a0a64f99edd5f30e5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed to distribute other PDFs. One of the primary links directs to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'audio to text converter' and a URL, suggesting a lure to disguise the malicious intent of distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=audio+to+text+converter+online+free
    • http://sunofij.practicegracenow.com/uploads/1/3/1/4/131453723/janimet.pdf
    • http://files.ezivase.com/uploads/1/3/2/8/132814261/d593444df0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/japefodafimeko.pdf
    • https://cdn.shopify.com/s/files/1/0439/1862/2875/files/weight_loss_tips_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/cs_go_crosshair.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/bekadron_se_karke_pyar_whatsapp_status.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3367/files/denobunurixibadowako.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/13772398901.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/kapijojufi.pdf
    • https://cdn.shopify.com/s/files/1/0457/3544/4646/files/angular_material_form_flex_layout.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/jofadudigetegukepug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/51599710070.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/woropasadimafomiwifenobod.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/jovafebarufidez.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007967.bin
a87321649621567dc959dc3776c926582bcf18c350626324cf0f72c6de202686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 4744 bytes
font_01_sfnt_off0000899e.bin
4fbed051151ba9f819ff2ec2766b72c2ce6e4e9fc7130ea538fdc74126eb01cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899E 10240 bytes

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