Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e13507fe77873b…

MALICIOUS

PDF

59.1 KB Created: 2020-08-30 18:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c684ff7db0b4c8b3073c72d436d8362e SHA-1: 21aa88dd9a440f1ce399fa5567d3b212a5722e4c SHA-256: 21e13507fe77873be4d65ff303aadd20fc9af48958fc98359ec3906d154489d7
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Assassin's Creed 3' and includes the malicious URL. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to exploit user interest through deceptive content.

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=assassin%2527+s+creed+3+homestead+missions
    • https://cdn.shopify.com/s/files/1/0438/1255/2864/files/kufiluz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/41075338252.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/dezetugagiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/reset_asus_router.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/69196515535.pdf
    • https://static.usrfiles.com/ugd/b8c837_a58955b17278475283872132fe14e640.pdf
    • https://static.usrfiles.com/ugd/67f5f7_edae88899f7a49bd99a513b5db9eee89.pdf
    • https://static.usrfiles.com/ugd/ab0441_07d643513b72453aa604ac9e6e614cc7.pdf
    • https://static.usrfiles.com/ugd/2f7815_89623526879c4d118e7ece689e196e89.pdf
    • https://static.usrfiles.com/ugd/a59130_99436a5a48e24f3787bc8e27541e8182.pdf
    • https://static.usrfiles.com/ugd/1b8612_68b4dc05779a4c97972b8fad84637797.pdf
    • https://static.usrfiles.com/ugd/90423f_acbe90b1c56b403888a4f3466fd048e6.pdf
    • https://static.usrfiles.com/ugd/10e3af_d54e78206a7d45509468ba56a2eaf414.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1982beb60f4633a0fc9de9b3d86fd8.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_off00009d49.bin
16847113efd8c6da8c3e34340245504e6ba521dd17f5c95cf17f0a28b669a17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D49 5120 bytes
font_01_sfnt_off0000ae75.bin
4fc5f114f70224707079f86abc2ef22c944d23418592787998bb2a6aaaa4af61
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE75 10060 bytes
font_02_sfnt_off0000d0ee.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 4324 bytes