Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d399dbf460f5e8…

MALICIOUS

PDF

37.1 KB Created: 2020-08-02 00:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec19851d28a21a1b6107c9ce9c45e6b SHA-1: e7812e65c47b613d800ab1206ed306d899a81a77 SHA-256: a7d399dbf460f5e898184f8d98f2860ec79656c933fd013b069f0a3e50d1cbae
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.cc/pify?keyword=git+flow+init' is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links pointing to shopify.com and other file-hosting services, suggesting a large-scale distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=git+flow+init
    • http://files.literarypubcrawl.com/uploads/1/3/0/8/130815303/wabapiwitoze-fezodiketa.pdf
    • http://files.brataussies.com/uploads/1/3/1/3/131379894/taronurenowo-furuzixowok.pdf
    • http://files.sharpeningdoneright.com/uploads/1/3/0/7/130740412/23bf8.pdf
    • https://cdn.shopify.com/s/files/1/0428/5651/3692/files/orange_county_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/3185593539.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/sword_art_online_novel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/60548386529.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/lurekalafuzeru.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/memobisitaruzeteko.pdf
    • https://cdn.shopify.com/s/files/1/0438/2959/2214/files/sigmoid_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/kozesegegolizazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/15810762055.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/4500285326.pdf
    • https://cdn.shopify.com/s/files/1/0445/6860/8927/files/pdf_squeezer_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/fiwerimuxuk.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_off00005616.bin
c4210a08e615c9b1310358f4f9275a889f27ea54c36cf0b7c038b0311a278aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5616 4400 bytes
font_01_sfnt_off0000653a.bin
6731b18e07827b8d46605af5042fb26cf13e58815ed4f58d2192b9260c98b358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 10172 bytes

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