Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbfa7278916967b…

MALICIOUS

PDF

55.8 KB Created: 2020-08-09 00:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab1376b9f3ef7cde1767c4e2a3713e2e SHA-1: 0c6300592edbfd54111dd5b9a10b3e5c9a4fd1b4 SHA-256: 9cbfa7278916967b9a4d9c70f87aa7d23b07981c8ef7ad9f8d0dbb6b17389df1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external links suggests a link farm or SEO spamming operation, potentially leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=biblia+de+estudio+esquematizada+reina+valera+1960+pdf
    • http://gozupa.thomascalderselections.com/uploads/1/3/1/4/131437601/lesolikim-kawiwupedulev-vibakav.pdf
    • http://zorulo.writerswithroomtobloom.com/uploads/1/3/0/7/130775918/garavefufab.pdf
    • http://files.halleluyahfire.org/uploads/1/3/2/8/132815220/deec8b6e4.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/fuvojobexosuwejunomese.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/velegapinamamulu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/89002451279.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/42272667947.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/analytical_maths_questions.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/42548154705.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/kedoletuxolulefivugaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/zefowe.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/26328232560.pdf
    • https://cdn.shopify.com/s/files/1/0432/3557/3919/files/38301173162.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004843.bin
cf71e92a1eaa1f2646ca3a4c8d190f8eed2863142838b3a0c136a0a8fdad98f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4843 17060 bytes
font_01_sfnt_off00007e3f.bin
c5950a96e0cfff444b40c641eea745d4cc8820f7fc124de5354c2166d1d2e684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3F 6116 bytes
font_02_sfnt_off000092fe.bin
fba56816464351a9a6e139845ed83d4e00c873a57e5ca87eccb1db7a362d65e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92FE 11860 bytes
font_03_sfnt_off0000b9dc.bin
389a5a281eb470fc4df5057fcb81a61a92ea34688355df1940d9e908d89b3f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 16248 bytes

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