Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa2d6e62056aaaf…

MALICIOUS

PDF

61.5 KB Created: 2020-08-02 22:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec18e8ea1591a05864805e77600ef271 SHA-1: 1961167b168020ba7c68e5268945abe1e780edcf SHA-256: 0fa2d6e62056aaaf8655a50b03bc18c76ee202143e27389dc8001a75761f5bce
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link to a redirector, which is part of a link farm designed to host numerous PDF files. The document body, though heavily obfuscated, contains the malicious URL and a lure related to 'cursors hack pastebin'. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common social-engineering tactic for malware delivery.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=cursors+hack+pastebin
    • http://files.hannahsouersdesigns.com/uploads/1/3/1/3/131383283/6973343.pdf
    • http://files.beachjerkylife.com/uploads/1/3/0/7/130775380/9579705.pdf
    • http://files.brainspaceclassroom.com/uploads/1/3/0/9/130969346/jewaxawoxamo_suruxefodako_kumibo_rukobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7211/1260/files/wodamusopozopi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/lunujumokuxujebipejaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/99993837775.pdf
    • https://cdn.shopify.com/s/files/1/0434/8048/1954/files/gowexefukozikonik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/93470377202.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/30471854033.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/tidaboga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/58991652708.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/87425782882.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e10.bin
3073b7b6e6ae3d1861ec71ef13078e157457fade5624652019b7a404c222bd95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E10 5096 bytes
font_01_sfnt_off00009f54.bin
fbcf2b739dae47788551f806445ac45ea9b2b4f2e165e4aaaf62235156e24102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F54 16504 bytes
font_02_sfnt_off0000d2d3.bin
49230a07578f2a0b108554ff1d47b1cb24b8f8081254bad551c0ce72ea05e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16544 bytes

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