Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1bcd7d45bf86f7…

MALICIOUS

PDF

59.9 KB Created: 2020-08-14 18:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2909f71a07a0b7382cce7fe75977007d SHA-1: d8c6be5c963775f1f5b59e56859195d9239e93ec SHA-256: fe1bcd7d45bf86f7927945b58e02a7f0e61e1398d379368a32d4036cc41a2553
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL pointing to a redirector service. This suggests the primary goal is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=opto%20isolators%20pdf
    • http://seroped.librarymatthew.com/uploads/1/3/0/9/130969551/vodewumoxozefo.pdf
    • http://files.ffquilting.com/uploads/1/3/1/3/131380000/8674642.pdf
    • http://mimunixa.kaydanley.com/uploads/1/3/0/7/130776886/2127162.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/67265072051.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/ultimate_tattoo_bible_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/fofaxobitunofimaju.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/15606771399.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4339/files/95234850262.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4656/files/puxidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/wosirinanoxawisanelal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/ximafonufekawa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/1851396055.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_off0000ad2f.bin
8be7845f48b05176b6955e4f1c306189b39cd3302801a2bc8997d8bc55dff07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2F 5060 bytes
font_01_sfnt_off0000be6d.bin
61ec0e710525a9252356e61318a7ff1c89d9eb383e7f046b3757397b0b4dd3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 10780 bytes

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