Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaac822aa892fdf0…

MALICIOUS

PDF

38.6 KB Created: 2020-08-03 17:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa5f6f7e0620b1b3c7607d7e5e3857df SHA-1: e3649ed95d1cb3a13d1f7fd54a205047cf45ae75 SHA-256: aaac822aa892fdf09f931aa3b836ce767ccccfb230a88a293b40ce358deab324
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify, indicating a link farm strategy. One critical heuristic firing identified a link to known malicious redirector infrastructure at 'ttraff.cc'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its immediate lure.

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=miocardiopatia+hipertrofica+dilatada+pdf
    • http://files.wendyfine.com/uploads/1/3/1/8/131872032/8920067.pdf
    • http://files.poetssquarehoa.com/uploads/1/3/1/1/131164542/turebu_ditobasilipi_vijigo_topemidoso.pdf
    • http://files.mallratsofamerica.com/uploads/1/3/1/3/131398010/41e32d.pdf
    • http://files.insideoutoutdoors.com/uploads/1/3/0/7/130738915/57ecf77b3d47.pdf
    • http://files.danaeirismcqueen.com/uploads/1/3/1/4/131438240/8287472.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/95220947902.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/sudatuxunokezoraku.pdf
    • https://cdn.shopify.com/s/files/1/0437/8476/5591/files/revujimiti.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/wuroxirazowobesonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/vowiduxuzizebed.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7701/files/22728676170.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/mugeguzapiwanuranu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/96632638929.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/content_analysis_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/tufidipakitasikoruwuxuxez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/bmtc_smart_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/bajixagejevubu.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_off00005d43.bin
1b2c7bf20eb7b8188364d271d377effe6bbe65b3bfe678a24832bf4556c1a561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D43 5072 bytes
font_01_sfnt_off00006e8f.bin
7f8b22a11f9797affb6ed3acc1788a674bca493ba26b4af11e10bb24f0e2d443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 9012 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.