Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9413315e9bfbb8e…

MALICIOUS

PDF

49.5 KB Created: 2020-08-30 03:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1d3f23e94a57baa987a39d3d253228 SHA-1: 2488efc4fd29231ae8a6fae7c53f6a725dd82be1 SHA-256: b9413315e9bfbb8e0ddc3b6397ee0c8dc5213d4a9c1a3d0ea577d6b0a7921dc5
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/wix?keyword=monster+hunter+world+lance+vs+gunlance, which is likely used to lure victims. The document body contains garbled text and a reference to the same malicious URL, further supporting its 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.com/wix?keyword=monster+hunter+world+lance+vs+gunlance
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/69021087022.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/extens_c3_a3o_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/40998874951.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9405/files/7485104695.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/85931337228.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/necroa_virus_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/kusebelupuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/76782529598.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/53134130570.pdf
    • https://static.usrfiles.com/ugd/b8c837_14dec97735fa48d18d97a2085a82bd09.pdf
    • https://static.usrfiles.com/ugd/b8c837_0564db30819642d980ce7fa014338bad.pdf
    • https://static.usrfiles.com/ugd/b8c837_cac89a27fce747b0a6f67eab3ad22d83.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfed4c8972d74e35ab2ed66be58ceae4.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/28211950897.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/72579339197.pdf
    • https://cdn.shopify.com/s/files/1/0445/8987/5364/files/pdf_to_word_converter_free_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/mikakunin_de_shinkoukei.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eef.bin
dd17b8f8d31ffdd0182bdeb0ae854910c116c3ff14f915a3da5a7929cfd2768c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEF 5360 bytes
font_01_sfnt_off0000813b.bin
59fff16160b44cff4c238e39c96ec3530b4ce48abef59aa16b196819805fd187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813B 10028 bytes
font_02_sfnt_off0000a3d6.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D6 16060 bytes

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