Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacbec9cc3b7be3e…

MALICIOUS

PDF

62.2 KB Created: 2020-08-28 23:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4b6a1e0b4580d0664ce376f8a810bd9 SHA-1: 29ae36522342d4e26e4eaea7722c6d45509a7a5c SHA-256: dacbec9cc3b7be3e015fd4575f75ced177b81a70f711265939c849833e49d8e2
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.com/wix?keyword=lakshmi+narasimha+karavalamba+stotram+in+malayalam, is embedded within the document body, suggesting a lure to entice users to click. The presence of numerous other links to external PDFs, many hosted on static.usrfiles.com, indicates a coordinated effort to distribute or obscure the final malicious destination. No scripts were extracted, and the document body itself is largely unreadable binary data, making the analysis reliant on the PDF-specific heuristics.

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.com/wix?keyword=lakshmi+narasimha+karavalamba+stotram+in+malayalam
    • https://static.usrfiles.com/ugd/b8c837_dd8ff4ad550544d0aeebc004da01322d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c98e0e70f5b47a8b89258136dead7be.pdf
    • https://static.usrfiles.com/ugd/b8c837_3965226ac8f9493e9a7333be8078ceb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc6fe953ec6424396a962789aae88c5.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/60880680166.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/diganesarajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2646/files/28794492460.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/44753770236.pdf
    • https://static.usrfiles.com/ugd/b8c837_e023013883454fd4b69c07d462d57702.pdf
    • https://static.usrfiles.com/ugd/b8c837_a510631e1bd34398915a53193dc1429b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3fd92bbe90345d5827dee7359051f6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_997ae683a9c349bf93a1d04be82e9c43.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e2cb3b5b63e4742ab0fab769c7a8d8c.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/free_pokemon_xy_game_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3921/files/92860717374.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b47.bin
b80e152ac8bcdc442b53afe3c24c23d4d3137b345999cc1d9fca562d6a9d2799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 5232 bytes
font_01_sfnt_off00008ceb.bin
ac6bb292bb4fe3f0ad451cb8c2d3f0ee26c7e9a193f49a5c07e79ee243f09f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEB 7088 bytes
font_02_sfnt_off0000a55e.bin
63ee7724ce0fa822bc4ae2592cfcc317631a2df79fc4212ff313d96bac4db545		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55E 15064 bytes
font_03_sfnt_off0000d388.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16164 bytes

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