Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f675f7124949a16…

MALICIOUS

PDF

54.4 KB Created: 2020-08-04 08:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c60de3275e2a407b8ada631c52158ca SHA-1: b762181b34adb94586975839cec2b6494f6bc86e SHA-256: 8f675f7124949a163dee9af02b652fb5c1e0586a2a7153542b8a8afbdfec6de3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign 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=bahasa+arab+amiyah+saudi+pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdf
    • http://files.davierespect.com/uploads/1/3/2/6/132681901/64447.pdf
    • http://files.englandaccounting.com/uploads/1/3/1/3/131379591/jofeluzikamepokud.pdf
    • http://files.antlerspecialtygoods.com/uploads/1/3/0/8/130813887/4000979.pdf
    • http://files.thebellhouse.info/uploads/1/3/0/8/130814900/d51f92.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/679735746.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/windows_modules_installer_worker.pdf
    • https://cdn.shopify.com/s/files/1/0440/0221/4046/files/6401549980.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/form_130_u.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/nadiniw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/65332843640.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/vulabemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/zajube.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/lewefavopapapawej.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/najip.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/ct_trang_file_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2128194791.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5881/files/speaking_mathematically_variables.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/applications_of_laser_in_engineering.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007026.bin
ee1616a6aa0fdc97cbdf839b1d5874a51bcffc81831e2aa4824035462214904b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7026 5540 bytes
font_01_sfnt_off000082d5.bin
84147cea455fb126bc38b8afdfec4f4b0fd7fa639b99db140a08d4b4ff94f8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D5 11596 bytes
font_02_sfnt_off0000a87c.bin
b99f89c1e94a880d01dc28223d657304e7f422686be1ee3816ba7be6a35b648d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87C 20960 bytes

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