Malicious PDF — malware analysis report

Static analysis result for SHA-256 0382d9426679608e…

MALICIOUS

PDF

35.8 KB Created: 2020-08-27 16:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 635df8662bc88840f4a27963782f3085 SHA-1: f0a8d97813f1084628008f0e073f95e5895a6eba SHA-256: 0382d9426679608ea67527e84b1a011e400d6386ba02b9061308dc6e31191ea0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded link structures suggest a lure to download further content, likely malicious, from the identified redirector. The ML classifier also strongly indicated maliciousness.

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=michael+bazzell+pdf+download
    • http://files.gruverstreefarm.com/uploads/1/3/2/8/132814476/5187c8a1922b44a.pdf
    • http://ssurll.com/10rckj
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/defudabatojavori.pdf
    • https://cdn.shopify.com/s/files/1/0461/9688/3614/files/lofibofijitirofawedaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/slim_whitman_i_remember_you.pdf
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/english_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/xufuramabagago.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2516/files/besame_mucho_piano_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/48375998972.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/21896273490.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cfb.bin
a13aa7486ded389e04e1e5d372f4b7ee7ecdc47053cae7244dd30a607ba514bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFB 5256 bytes
font_01_sfnt_off00005ef4.bin
6c6ab1fdb62257a9872631ea04238c213965eb3bac972aab32054361e10cb8db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF4 10580 bytes

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