Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb147c992c2e6661…

MALICIOUS

PDF

49.5 KB Created: 2020-08-09 11:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b9ca345269fd6fcb57868b313b9011 SHA-1: 719bc3f5b8e8d04adbda2759bf72f6c039d58484 SHA-256: fb147c992c2e6661946e7c53385fe4de743a98f3667ed0d3ff900bdd660580ef
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=ap+10th+class+maths+textbook+english+medium+pdf'. The document body, though heavily obfuscated, appears to contain keywords related to educational materials, suggesting a lure to disguise the malicious intent. The presence of a link farm and the ML classifier's high confidence further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=ap+10th+class+maths+textbook+english+medium+pdf
    • http://tenul.paintboxartclasses.com/uploads/1/3/2/6/132682076/mobepu-zidojewib-vawupufigelanis-rivorobopuvene.pdf
    • http://files.parallaxphotographyrs.com/uploads/1/3/1/4/131453247/5146294.pdf
    • http://files.lifeconnectioncenter.org/uploads/1/3/1/6/131606876/76b80.pdf
    • http://files.pathwaysforhealth.net/uploads/1/3/0/8/130874086/b4d00452.pdf
    • http://retobu.pazangallery.com/uploads/1/3/0/7/130740596/xupewunux_volisituta.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/93955144587.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/befevabazasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wogol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1421/files/48308995826.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/36472294579.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/poberizebipibilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4714/8950/files/vizumarizugerafidapotijid.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/giserokosuxipobufixa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/second_shift_arlie_hochschild.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/dog_fucking_girls.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/tojewuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/epidemiology_of_bovine_tuberculosis_in_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/avadhuta_gita_malayalam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ab.bin
3d9b22c50c6f2f88da7346b4717fe200f6d0827133b8964a469865360f51494f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AB 5928 bytes
font_01_sfnt_off000086c3.bin
9041099452ea723886b7e2e10a3d34a403db40b5eb25a590c31d438c8f3ed757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C3 3488 bytes
font_02_sfnt_off000094a9.bin
967f59aab4fb95c302cd66473390f378a490502442a5df5afcf69c0e87e13930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A9 10356 bytes

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