Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb9ea72a39032c0…

MALICIOUS

PDF

46.6 KB Created: 2020-08-30 10:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edfec2b8778c77fc7294d34cb255b2da SHA-1: e646152b0bce4b3119284851dc598aae285056e5 SHA-256: 7bb9ea72a39032c0aacf7fe5387c450eb208743706682d2561c331479adbe866
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Blogspot pdf descargar' and includes the malicious URL, suggesting a lure to trick users into downloading malicious content. No scripts were extracted from this sample.

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=blogspot+pdf+descargar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/44107132502.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/begofevugivu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/zulixexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/28279595389.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/vutibelumige.pdf
    • https://static.usrfiles.com/ugd/429b25_0672a545fc654a7d946320c333af6946.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba385a38c96a47f6959ba425c99e3d8d.pdf
    • https://static.usrfiles.com/ugd/dad90e_c6f7e4989ac84aa4adc27b7138218670.pdf
    • https://static.usrfiles.com/ugd/22739b_7ddd939bd1f04111bef21f1397dd2ef9.pdf
    • https://static.usrfiles.com/ugd/1a89c8_215bd11853df46138764feceb4e6c101.pdf
    • https://static.usrfiles.com/ugd/de02f3_9c847aee5e1345628c363e63d7a5fabd.pdf
    • https://static.usrfiles.com/ugd/c1108c_99c043b039d34543af0b33f940a2cc9e.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_off00005d55.bin
73c249b1047d92362ef086f813219541062c05c4c13e943c6bf7a0b5ccfbd6de
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D55 5372 bytes
font_01_sfnt_off00006fa8.bin
884600a615e2dc3487f743902a749e458dd0a7cdf009302dcae25c74029929fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 12940 bytes
font_02_sfnt_off00009884.bin
6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028
pdf-font-stream PDF embedded font (sfnt) at offset 0x9884 16132 bytes