Malicious PDF — malware analysis report

Static analysis result for SHA-256 5137afe8ce02c5bb…

MALICIOUS

PDF

41.9 KB Created: 2020-09-06 21:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b3ea766b2dfb034e42b6bce1380356c SHA-1: e0232acc38a997b5fd735ffcf4a2f41b05729545 SHA-256: 5137afe8ce02c5bbfda695a807df8d1b60c2e7272dde2fe40b60e7c18bbaf7f9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=ariston+velis+evo+plus+80+pdf'. This URL is likely used to redirect users to a malicious site for phishing or malware delivery. The document body, though heavily obfuscated, contains the same URL and product keywords, suggesting a lure. The presence of a large number of external PDF links also indicates a link farm, often used for SEO poisoning or distributing malicious content.

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.club/wix?keyword=ariston+velis+evo+plus+80+pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/nurobapisiri.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/72942639989.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/jinja_template_extension.pdf
    • https://cdn.shopify.com/s/files/1/0439/3861/1355/files/albums_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0435/6951/2607/files/wuzajiloloxefobowasevan.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/38255910343.pdf
    • https://static.usrfiles.com/ugd/b8c837_01b1f4147b24433b9913a6f7bd2d4617.pdf
    • https://static.usrfiles.com/ugd/158fb9_5067331a55e348529511334dffd98abd.pdf
    • https://static.usrfiles.com/ugd/a298ce_bb6ea057383d4ebdad060d8885858054.pdf
    • https://static.usrfiles.com/ugd/d38238_b4762f853d2d4256ba4ea5f9f863a0f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4467c5b00ebe4e0292dafdbfc202cd1a.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_47b6b4ec768542c1bde72d47b81bfe93.pdf
    • https://static.usrfiles.com/ugd/61804c_efba4bcb8c334772aa1510e2fa4643ac.pdf
    • https://static.usrfiles.com/ugd/95bb70_1915accaa98f48f59ae6db839f3bffc8.pdf
    • https://static.usrfiles.com/ugd/bf57b5_4fbe67cd155f4bfab632dd027df10eda.pdf
    • https://static.usrfiles.com/ugd/625844_9c9af5f489314fa6937e14ea140599aa.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_off00006587.bin
1db0e9231d1ebbba03a662abf54d6b44c975dec64560f096c602216d75ca7df6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6587 5208 bytes
font_01_sfnt_off0000775c.bin
ce6c854172f54a13805cbc436d22cbfb4ce70d719091928cccbc7ef468e497cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x775C 10316 bytes