Malicious PDF — malware analysis report

Static analysis result for SHA-256 9409865e7de01c6d…

MALICIOUS

PDF

80.0 KB Created: 2020-08-02 20:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed7b966e223d95d4f79bd5fb4a9d42a SHA-1: dedae3c5a51d54f8e374f62865e74830af2ff298 SHA-256: 9409865e7de01c6d830de44f265ec9bf68b4c06f00b8bfa2287d71df9587f6e4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external sites, including a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=learn+git+branching', which is flagged as malicious. The presence of numerous links, including those hosted on Shopify, suggests an attempt to create a link farm or to redirect users to malicious content under the guise of providing related resources. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=learn+git+branching
    • http://rumega.laquintonholliday.com/uploads/1/3/2/6/132695306/jekikizi_suxim.pdf
    • http://files.forremarkablemen.com/uploads/1/3/1/4/131409463/9654158.pdf
    • http://files.hunterdelves.com/uploads/1/3/1/4/131453397/b66f9fcc14c.pdf
    • http://files.neuropolisblog.com/uploads/1/3/2/7/132740193/5b658ea7fe75e06.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/tixogobebujoxizuxukufefuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/lofasuvowodajevuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/bikojezaludedekixunilado.pdf
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/4643101195.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/dasufavope.pdf
    • https://cdn.shopify.com/s/files/1/0440/3675/1525/files/litopejegajazetovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/simple_javascript_countdown_timer.pdf
    • https://cdn.shopify.com/s/files/1/0438/9978/1275/files/22937095780.pdf
    • https://cdn.shopify.com/s/files/1/0438/0327/9517/files/eminem_encore_zip.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/john_deere_air_compressor.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/76416883316.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/stihl_ms_261_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/28403802577.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_off00008919.bin
b932cea3e56581866605c5e123a66720cb370e2b118070bdba6fa2c5802e3093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8919 33320 bytes
font_01_sfnt_off0000f02c.bin
fe735a99f4f205861b074e5a674d2f785fbdb0c5eb06f751ff981c6b0edb58e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 4932 bytes
font_02_sfnt_off000100f5.bin
897aa2e980028036ebce565d3c208d749d160a9b2f62ae1198adc13616c9b9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 15264 bytes

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