Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbc5b33d5ce8cfd…

MALICIOUS

PDF

145.5 KB Created: 2020-08-30 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf683be3560e5072c56d5fc4a8a9134 SHA-1: 7d0bb1610ad8e9d77564e1b00af7b5e1960eae89 SHA-256: 2cbc5b33d5ce8cfde92fb8e97909213d669a0ac85a5529c71f309f5133bdb9a8
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.cc/wix?keyword=au+gun+gungeon'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to generate traffic or distribute content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=au+gun+gungeon
    • https://static.usrfiles.com/ugd/b8c837_7edd44ac085d4c6fa20bd1fb0a4a616f.pdf
    • https://static.usrfiles.com/ugd/8127dd_3ab4351db99d4e3e81daf67b0d42ac77.pdf
    • https://static.usrfiles.com/ugd/3f80ec_3a1c508ea2c34653b1dbb352c1edf454.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/sisitulegowelavojonaxiden.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/accepted_2006_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/fisiologia_animal_adaptao_e_meio_ambiente_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3443/files/peziparanevidupaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/perfecting_your_english_pronunciatio.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/mifirazerolokigov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3150/2749/files/tapupipox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/63980821860.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/pekusevugekukuxaniso.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_off0002046e.bin
0c26e13e7cd98cb4ea31c7b12473ef84fd9ab8215759181df79b7a0d7e9d812c
pdf-font-stream PDF embedded font (sfnt) at offset 0x2046E 4324 bytes
font_01_sfnt_off00021340.bin
421bdc71066ad8df085efd33fb343d3148fb1f9b2c7e623b65f2169beb75538d
pdf-font-stream PDF embedded font (sfnt) at offset 0x21340 11284 bytes