Malicious PDF — malware analysis report

Static analysis result for SHA-256 121915bd9a84fbcb…

MALICIOUS

PDF

42.5 KB Created: 2020-08-04 11:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4555d6d80ee4c9d043d38f2bd852867 SHA-1: d858054fed83ec7b0ec9b265fa7040584efe3f3c SHA-256: 121915bd9a84fbcbfcc41fe8e300b5e74d148f8bdc8345ffaffd93bdf058560e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body and heuristics indicate a link farm strategy, with numerous embedded URLs pointing to various PDF files, likely to obscure the malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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=australian+english+vs+american+english+pdf
    • http://files.jbmilart.com/uploads/1/3/1/4/131438299/betamin.pdf
    • http://files.ballaratspine.com.au/uploads/1/3/2/6/132683088/dodimizor.pdf
    • http://padagenoj.hfnyourvoice.uk/uploads/1/3/0/8/130813765/xifirozovefakosawaje.pdf
    • http://files.handynola.com/uploads/1/3/0/8/130874086/7186513.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7364/2406/files/puppy_training_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9783/files/wunenuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/gofunovosalodilidameture.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/padojelimaxafufadosalud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/sewalux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/43849937345.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/59508718724.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4902/files/91323889241.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/36639815601.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/wekenabidolen.pdf
    • https://cdn.shopify.com/s/files/1/0428/2109/1484/files/86002983935.pdf
    • https://cdn.shopify.com/s/files/1/0440/9769/9992/files/june_2017_algebra_2_regents_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/jeruxizakaninapizemifuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/gepebukolerewafu.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_off00006703.bin
b54c31a638bc305a667e22c1b6124ad91a599d76cf2ec3c9e74ae34f3aad4988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6703 5620 bytes
font_01_sfnt_off000079ff.bin
822e5ee4ba8925e077b58b38a193906b22b55dcd8079535496ff77d94ff9f5ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 10204 bytes

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