Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08361c86c14b76c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 14:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca377c09f740dd0293a1e94ef2ec460 SHA-1: 92a7f60cf7b6dfdbd81854d70fafd8bdeed1606b SHA-256: c08361c86c14b76cf0a584f7ddb7dba0286b17f31d40a153bc9eb314e4889c43
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a URL that mimics a Windows 10 update download. This, combined with the PDF link farm heuristic, indicates a social engineering attempt to trick users into visiting malicious infrastructure. The embedded URLs and the document body text reinforce this lure, suggesting the primary goal is to redirect users to download potentially harmful content.

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/wb?keyword=windows%2010%20creators%20update%20download%20manually
    • http://files.southaiken.org/uploads/1/3/1/3/131379014/9299323.pdf
    • http://labakaj.wingsopen.com/uploads/1/3/1/4/131482853/burogugigotutez_xivaz_megatufumuj.pdf
    • http://files.swcpurpose.com/uploads/1/3/2/7/132711999/1d236c5f15f8c.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/guia_de_medicamentos_y_para_que_sirven.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/vaboferu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/zulugivotosikeworifutuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/pofijubu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/shuttle_badminton_court_size.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/bijenawotasapexozigun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/zugawuwubozepikelonatuwim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/treasure_map_terraria.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/87788999741.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/84861713112.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/90298303584.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/28456916616.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/46130051890.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_off00005fe0.bin
8dcf825503db02073e6e14e73637a02524f343fe581fe46f8fe6a00b8390484e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 5620 bytes
font_01_sfnt_off00007309.bin
b501c7b43518f33da1454b629a746a2e929583cb42bebbf3179a20721a93f237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7309 9920 bytes

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