Malicious PDF — malware analysis report

Static analysis result for SHA-256 0324dbf2a959380c…

MALICIOUS

PDF

51.6 KB Created: 2020-07-31 22:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe3f3913e6c23a421ae74eb683b5b85 SHA-1: 5850d992c9b9a6eb91dd46b9dfd13719b8900b30 SHA-256: 0324dbf2a959380cd0f8a036ca1b998a2e563db8f6a483651819de2d3dda4de2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=wrath+of+nature+skyrim'. The presence of a 'download button' lure and the ML classifier's high confidence further support a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wrath+of+nature+skyrim
    • http://files.windersonscreations.com/uploads/1/3/1/4/131409009/lisidas.pdf
    • http://files.tekesintidewater.com/uploads/1/3/2/7/132710795/rosudofaf.pdf
    • http://files.homilytools.org/uploads/1/3/2/8/132814439/fa78e3ec6cd7b.pdf
    • http://files.worldtraveladventurer.com/uploads/1/3/1/4/131407194/5900834.pdf
    • http://files.920cattle.com/uploads/1/3/1/4/131454221/cc602f021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/78761169676.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3003/files/muzupubibulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/nofafat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/tesijijibagoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/2412741818.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/644048978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2860038855.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12457093378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39748763391.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/zizezoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/dobujen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db0.bin
fc549defc99fbdaf0c2d81af2fbac3cfd1fa791a560b2f3b1e831b40e4db89a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB0 5156 bytes
font_01_sfnt_off00009f22.bin
a07d3e9c5862fc260953f03efcfe307ae491e07faee321e6e87116f3064cb1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F22 10164 bytes

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