Malicious PDF — malware analysis report

Static analysis result for SHA-256 5540ca69901a4946…

MALICIOUS

PDF

57.2 KB Created: 2020-09-01 05:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a2d8d52cf06651ae9aeba2dbfd23c4 SHA-1: 5647750737f0694e20a7369306ce14f3e533b901 SHA-256: 5540ca69901a4946b12c0f7a233895a287206362c94f9bf229fe59685026f6da
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.ru/wix?keyword=bisso+na+bisso+racines'. Additionally, the PDF is flagged as a link farm, containing numerous external links, many of which point to 'static.usrfiles.com' and 'cdn.shopify.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other PDF 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/wix?keyword=bisso+na+bisso+racines
    • https://static.usrfiles.com/ugd/b8c837_c8bb3b6efe8d4c31b864064d81324398.pdf
    • https://static.usrfiles.com/ugd/837d34_9bf0aa33d9934b88a5622b5c49c376de.pdf
    • https://static.usrfiles.com/ugd/2274a7_b83f9406c7da4e02bd7488946c6d803e.pdf
    • https://cdn.shopify.com/s/files/1/0438/4935/1328/files/jebazedik.pdf
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/87539420379.pdf
    • https://cdn.shopify.com/s/files/1/0431/1131/7658/files/mujuzotulozede.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_17bbd68210ae479f8553af409104ac1b.pdf
    • https://static.usrfiles.com/ugd/575363_6f0d297eadf745f5bd69d96722fcaf69.pdf
    • https://static.usrfiles.com/ugd/8b97dd_f0c3ab8a4cf541c9abdce7e732475e78.pdf
    • https://static.usrfiles.com/ugd/efb3f0_e9f1890a109048478bc56b38aab11bdc.pdf
    • https://cdn.shopify.com/s/files/1/0464/5231/0184/files/b._a_pass_movie_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0434/2431/7607/files/active_and_passive_voice_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/66430885059.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/virgil_abloh_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/folebodifasepif.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_off000096bc.bin
4c337d17add24f48bca76fd6a502cfa81358c8940df6f0b8925c3f28aeff4e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96BC 4660 bytes
font_01_sfnt_off0000a682.bin
410d5a8627b5a0aa1dcf6a6de9d56a6a42c0f5ab2a320008b9979378d2ebda7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA682 10308 bytes
font_02_sfnt_off0000c9ce.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 4324 bytes

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