Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ea11668a341b0…

MALICIOUS

PDF

48.0 KB Created: 2020-08-03 01:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ca72c08fd3515ccdbd262011412e6bc SHA-1: 14701ea1aa57a9ce8baded5f344b10bc4308c3a7 SHA-256: ff7ea11668a341b0da8a741808dbe45ff86612aee3c3adb8c8a729f43004ce37
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large farm of external PDF links, many hosted on cdn.shopify.com, suggesting an attempt to obscure the true malicious destination. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to phishing pages or malware downloads.

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=personal+anecdotes+examples
    • http://files.nekimastrategy.net/uploads/1/3/1/3/131383456/sesoni.pdf
    • http://files.designsafetyllc.com/uploads/1/3/0/7/130775632/4633575.pdf
    • http://files.southernaznorml.org/uploads/1/3/1/3/131380687/3643902.pdf
    • http://files.mystgeorgesrugby.com/uploads/1/3/1/3/131379846/39c1944510857.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/jutupitamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/engineering_graphics_with_autocad_2014.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/59922745540.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/zetilipolimegidozebojuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/gegapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/mazinovaterekibabebaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/ganuwifakuzizifadukitede.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/87625683806.pdf
    • https://cdn.shopify.com/s/files/1/0432/4425/7442/files/tinidofow.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9883/files/sing_a_christmas_carol_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/8732643487.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/bemuwatikifagajubular.pdf
    • https://cdn.shopify.com/s/files/1/0439/0082/9848/files/nadunumopas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.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_off00007b83.bin
dcd3a251ee2f30d013f111388691ac167d96f2d770b76181d92645e9cf8189f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B83 5288 bytes
font_01_sfnt_off00008d68.bin
58e553dbcbaa6e4712202e4c898d4fc26b1a8b3a87ff27e36b75850ffb44750c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D68 11144 bytes

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