Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66a3b38039ef7ac…

MALICIOUS

PDF

45.7 KB Created: 2020-07-24 21:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32d8010bca79d42963b3de576a40dc60 SHA-1: 06343cbd823d6ed6958d9db17a10a0bec028c09e SHA-256: d66a3b38039ef7acd5984f8b5dab251458c09a10609c0fe8ce6ffb3173974ecd
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.cc). Another heuristic flagged a PDF link farm, indicating a potential SEO poisoning or redirection tactic. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated.

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/pify?keyword=chloroformic+acid+methyl+ester
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdf
    • http://files.newbethelbaptistga.com/uploads/1/3/0/9/130969990/6423343.pdf
    • http://files.kimberlysfarmflowers.com/uploads/1/3/0/9/130969703/4027302.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/70305964866.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/40258147350.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/rejomixedariken.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/tuvozanokov.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/74512372450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7607/files/6737133477.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/kuvorubopinutevul.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/joliler.pdf
    • https://cdn.shopify.com/s/files/1/0434/7228/9944/files/32737583155.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/93096767827.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/48074431285.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_off00005d2f.bin
5e46f47e3a116051831ae75903222f7a7b0bac3d7ab76dc8db59c313c83c8980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 5068 bytes
font_01_sfnt_off00006e72.bin
342536abd3e9cb8804f5d891a6b84417ff7a24dc76b395962ecd95cddaa34532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E72 11104 bytes
font_02_sfnt_off00009489.bin
3d50f22d3ae6d9a4461c814f81554cc573a3512c555c2f223aedeeaca19cd658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9489 16080 bytes

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