Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e61b39b50bcda9e…

MALICIOUS

PDF

60.9 KB Created: 2020-09-01 01:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6843a13a8733eb4b4214db5fcee0c29 SHA-1: 02552fecc9a9249332a193da0656e679429c5b13 SHA-256: 0e61b39b50bcda9e1976ef36a1b168c372f4ec6afca0140743396cbc340a501d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into downloading software. The PDF also contains a large number of external links, indicating a link farm strategy.

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/wix?keyword=switch+audio+converter+pro+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2e4eb4_6c7f203dfc704b7fb500750965040080.pdf
    • https://static.usrfiles.com/ugd/87d215_cba65feddee14e22acca6fc49ed47144.pdf
    • https://static.usrfiles.com/ugd/a2d007_144c5e178b7d47a4bca408ed090a6e79.pdf
    • https://static.usrfiles.com/ugd/857e61_d6eae195ffed47219b6ab16a67394192.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_a6309c5b8bf34a18b7c38488c77ed15f.pdf
    • https://static.usrfiles.com/ugd/173616_285af669993849a194f13359521912bc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/95738698512.pdf
    • https://cdn.shopify.com/s/files/1/0437/6913/5262/files/jisulalilupibosesugedod.pdf
    • https://cdn.shopify.com/s/files/1/0447/7770/1533/files/ac_to_dc_converter_circuit_diagram_without_transformer.pdf
    • https://static.usrfiles.com/ugd/10b11f_a14af4bbc0664267a455b664f020399f.pdf
    • https://static.usrfiles.com/ugd/d01287_bf648d7b53b54cc28fcb728d4e2be617.pdf
    • https://static.usrfiles.com/ugd/b8c837_e675a2250c904eb7b62ac519e0869a72.pdf
    • https://static.usrfiles.com/ugd/ef7b09_63781827a55d40b59f6e690e21ad4c35.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_off00009862.bin
50c6a62186e16af14c19e938361c8306f04d40dbe110d3b30803321cd09a49d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9862 5268 bytes
font_01_sfnt_off0000aa60.bin
8c220910f8fc757e515e3234f7f57d95212abc8a8a77dbc77bef2945ec85e336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA60 11244 bytes
font_02_sfnt_off0000d0d8.bin
a5a5500250e74c90bbca065cb4262b800cc470f6c9cdbf9d710cda96e37a3cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 16264 bytes

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