Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ffd785d5602c02…

MALICIOUS

PDF

55.4 KB Created: 2020-07-22 17:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe578e8e195254179a8ae0b4f7639db SHA-1: 6de2387600b6da4dc4e8aed341c455f17401336b SHA-256: 28ffd785d5602c0273c70f1fb1108cffbd873a2cb6af8bdb8098aff6e6eeffc8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious PDFs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=core+java+multiple+choice+questions+with+answers+book+pdf
    • http://files.valeriesplayhouse.com/uploads/1/3/1/4/131406403/rilavapijijepapa.pdf
    • http://files.hullabaloomusicfestival.com/uploads/1/3/2/7/132740415/zikomigop.pdf
    • http://files.harperraephotography.com/uploads/1/3/2/7/132741089/nasaboladisojaj.pdf
    • http://files.tilliesnevada.com/uploads/1/3/1/3/131379612/xapixivote-pipugu-neruxesivalu-wifuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/netevoxaverurevowuxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/92732205677.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/65794300980.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://gofifod.files.wordpress.com/2020/07/valovekitoxijametuzok.pdf
    • https://zumexif.files.wordpress.com/2020/07/95371547432.pdf
    • https://fukagutezi.files.wordpress.com/2020/07/782466737.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/66826391242.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/34059210766.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/wegebuwunoremaxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/wejulekaxapigabugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/dujulasugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/20300135000.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/73334746817.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/nasuriximugalixav.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/
    • https://cdn.shopify.com/s/files/1/0428/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009479.bin
f0dbf23742b8c4e671e28296be269cd4f479cc19e68f264bf238673082cf60e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9479 5856 bytes
font_01_sfnt_off0000a84d.bin
1c3730c02fe8ff11d3f708cc3edb3ec8dfea6a7a2d4b60171e5506a4e71578a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA84D 12024 bytes

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