Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88c9917442fa478…

MALICIOUS

PDF

34.9 KB Created: 2020-08-24 23:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dc934aa5f567d2abc6d83b28de14e2d SHA-1: eb111ff27e343bc34e3c388e4590023a21fcec35 SHA-256: f88c9917442fa47809cbcb227ce72fa009df676f290ff808a32c4fa7d7712125
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Like a bullet train song' and the malicious URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and link farm indicate a delivery mechanism for malicious 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/pify?keyword=like+a+bullet+train+song
    • http://giresigi.theramblingrebels.com/uploads/1/3/1/3/131383613/fafonixezuxixipiga.pdf
    • http://files.tarzanstravels.com/uploads/1/3/1/4/131454549/suvijam.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/74845783931.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7046/files/gukumuwunakabarura.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/how_to_download_udemy_videos.pdf
    • https://cdn.shopify.com/s/files/1/0458/6405/9033/files/dukukiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/2595642827.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/45942415637.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/mastering_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/kenmore_sewing_machine_model_158_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/wukapinabasefewudo.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_off000043f3.bin
07a371e223918b9c8bb8de8aacfea2512461d63a6189428b06edee00ce26f25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43F3 4996 bytes
font_01_sfnt_off000054fb.bin
1e7ef5e95ff7e2151d2274d58d474b1312b44865a64a01c67bfb030eede5c51c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FB 13600 bytes

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