Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede9d7ae5b5e1cce…

MALICIOUS

PDF

42.0 KB Created: 2020-08-06 10:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db87a21e5a52bff62d603b83290cef35 SHA-1: bce5389b5a88b55b34514651ecbea3065e1c5f9d SHA-256: ede9d7ae5b5e1ccea2d32d4a3f24995032722239951acddd291b3196c6a69b17
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Override T1059.001 PowerShell

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.ru/pify?keyword=cultivos+agroecologicos+pdf as malicious. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is largely unreadable binary data, suggesting the primary malicious function is achieved through the embedded links.

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=cultivos+agroecologicos+pdf
    • http://files.morrismindfulness.com/uploads/1/3/2/8/132815183/2633018.pdf
    • http://files.anthonybosman.com/uploads/1/3/0/8/130873718/sozutisiwulufeledusi.pdf
    • http://files.mrjasonsweeney.com/uploads/1/3/0/7/130776619/tosawasixinawew_kokenupeti_milujafudeg.pdf
    • http://rakurife.loraincountyohc.net/uploads/1/3/1/4/131453177/woxepizi.pdf
    • http://bonozo.clubfitnessinspired.com/uploads/1/3/1/4/131407164/kemijunixikilulireze.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/52461137856.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/46371405235.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/wordpress_multisite_htaccess.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/40925935047.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7360/files/ubuntu_install_mysql.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/vewemazovufezonomovesamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/16115377227.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/81332112364.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/33295346490.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/balawakonozuxumujuwazuta.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/sigmaplot_13_crack.pdf
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/tudamebidoluzonagobi.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_off000066f8.bin
99c83758e8b98775ea7b7e4e48a2bd5d06f82f5dd92469a4ba8bbe08a7eb7b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 5288 bytes
font_01_sfnt_off0000790c.bin
01b67bc86c0106ce900da81cfe4f330e2223c93b9c2d921fb1b2d62eaadcc6f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 10264 bytes

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