Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcb24ff3f743e00…

MALICIOUS

PDF

60.3 KB Created: 2020-09-02 04:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb453ff168ec41b98a0fef888f2dd67f SHA-1: 0eb10e2750534841b76e0d316cac3966b1273773 SHA-256: cbcb24ff3f743e00ff914ed7ef8d04decfb285b7e56d8867f018220c805cf7be
154 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.com/wix?keyword=assembler+programming+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to entice clicks. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=assembler+programming+pdf
    • https://static.usrfiles.com/ugd/11baf9_fab836e8ed44419794be3c00c539fff1.pdf
    • https://static.usrfiles.com/ugd/9a242c_19f8bb823bc04070b3a1cceee670bfa2.pdf
    • https://static.usrfiles.com/ugd/8b97dd_51f9034119254b72829da717474cf352.pdf
    • https://static.usrfiles.com/ugd/b8c837_33addcbd8a7c4947b9607219c9691ddd.pdf
    • https://cdn.shopify.com/s/files/1/0437/8433/9613/files/defujupuxeram.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/47245717985.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/68104659896.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/jefexava.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/solja_boy_report_card.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/ameristar_heat_pump_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/54289916750.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/3603107738.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/jaxeraxebetemebusiwas.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/
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/6

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac49.bin
af920fd944c77b089fc438ca7c6f0fbfdf026acb34a403ce19b5b9ea545916b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC49 5492 bytes
font_01_sfnt_off0000bed4.bin
bb67d4149fef2405df5997c497904a49484dada46f8f3dd7adeac727696d78d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 10976 bytes