Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7a553102f8d9d…

MALICIOUS

PDF

51.2 KB Created: 2020-08-02 12:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd282d081f0c4ceb3a0553665476b762 SHA-1: e0f217239f77561992d6f84ec519b002288d7b79 SHA-256: 84c7a553102f8d9d2661a05335febb34e4f2d878fd5b64a0d39aa477c496eb6a
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links. One of these links, 'https://ttraff.cc/pify?keyword=iana+timezone+list', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com and various other domains, suggesting a link farm designed to distribute malicious content.

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.cc/pify?keyword=iana+timezone+list
    • http://files.belindadurrant.co.uk/uploads/1/3/2/3/132302892/xutinebuzikagizixogo.pdf
    • http://files.robbexpresssharpening.com/uploads/1/3/1/3/131378953/derajewebuzuxukagu.pdf
    • http://files.hdtrbch.org/uploads/1/3/1/4/131455463/wirojexi_gafar_bawokofujilamiw.pdf
    • http://files.gregpatmore.actor/uploads/1/3/1/4/131438474/9277904.pdf
    • http://files.northstartheatercompany.com/uploads/1/3/1/6/131606186/wogixogapobufaz_ravuxone_jebuzemas.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/54700832867.pdf
    • https://cdn.shopify.com/s/files/1/0440/2623/2997/files/wulikefuwulezulesudimu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/gizivose.pdf
    • https://cdn.shopify.com/s/files/1/0433/4567/4389/files/30883591990.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/53611046579.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/bokufox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/62196145428.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2804/files/70760116352.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/pawifinibowubumepomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/31937828387.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/bobcat_853_specs.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/31205364366.pdf
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/ronedunom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/nevebebokezumomad.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_off00008bb3.bin
b9af5db105c0a3a6eda13022a3ac0ee5e88dab0783146fa5f29a6483fec0a4e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 4720 bytes
font_01_sfnt_off00009bb5.bin
c032d7c24b74f925c1ac8ca56f2752fa344cd86424323582a3d266f866827525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB5 10468 bytes

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