Malicious PDF — malware analysis report

Static analysis result for SHA-256 365d65a3f10c7736…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 07:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9058b64c73bb154033324f063aab7b6 SHA-1: 3eb0f4a930f7e07b614ef5735c3e8df6dfeb624d SHA-256: 365d65a3f10c77368c5ed02fb355e08f05059e7235073b60cc868941378a5b1b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=understanding+binary+code+pdf', is designed to redirect users to malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely to manipulate search engine results or distribute further malicious content. 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=understanding+binary+code+pdf
    • http://dixewinu.playngrowdaycare.com/uploads/1/3/1/4/131406717/wuwilixar-muximadejem.pdf
    • http://files.thesouthchurch.org/uploads/1/3/1/3/131398095/jenesabozelaze-kifojanawegaga-sotutod-nekenizuroruwob.pdf
    • http://fifisumuw.abbottconstruction360.com/uploads/1/3/1/4/131438137/wurufabazefasu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/high_school_graduate_resume.pdf
    • https://cdn.shopify.com/s/files/1/0429/1562/7175/files/mubuxapelukujomop.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/28129898623.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/adobe_indesign_trial.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/78056103047.pdf
    • https://cdn.shopify.com/s/files/1/0447/9585/4997/files/invitation_letter_for_visa_sample.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/34274505140.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/kogozaxizi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/doxarazinowosuzisidulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/lefarabirax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/carpophilus_hemipterus.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/17075794874.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/zopikuxezitufosikepaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/24979075073.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_off0000679e.bin
e01af1fb0f373c6f69b01cba57668db519cd56007f066145665242e137de6b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679E 5524 bytes
font_01_sfnt_off00007a7d.bin
8fa5b4efc1c2d5893a79fa0144aeab3aff612a077bfa3ed04f0547d4d888a546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7D 9948 bytes

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