Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1533a4320f880d…

MALICIOUS

PDF

39.9 KB Created: 2020-09-08 07:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d566f0bff7503a4016af10de6842769a SHA-1: 2d314d7bd7d7935a3e2d5509e68ee27e94995e98 SHA-256: 4f1533a4320f880de258af39bb9be1f1779fd6299d83fef16ef93f242efcc052
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/pify?keyword=anthracnose+of+cotton+pdf', suggesting a lure to trick users into visiting malicious sites. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed for SEO manipulation or traffic redirection.

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.link/pify?keyword=anthracnose+of+cotton+pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/multiplication_word_problems_dadsworksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/all_dnd_races.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/wujapufaxalosa.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/nami_build_aram.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/86914968919.pdf
    • https://static.usrfiles.com/ugd/37987b_f5adc2f376744e30bb3b6ab517345200.pdf
    • https://static.usrfiles.com/ugd/1acd69_bc84a6416fa8470887281bac0b781098.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/absceso_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8437/files/pdf_converter_computer_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/2886/3397/files/messaging_app_for_ios_and_android.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_off00005f4e.bin
b6c453f6d745d77a57db0405f070d60d93da827fca696929bae9400dc08b836f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 5200 bytes
font_01_sfnt_off000070f9.bin
171357f03e6fb60d2b7d25e94022fc3a76d5bf8ffc21ee5e84a2e0a874eeb84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F9 9880 bytes

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