Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b169253c920604…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 13:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93f7ca0d428debcb6a3cd3f49ed245e SHA-1: 5a7f91123d0211508fd14843f0a4fa7fd963cfa3 SHA-256: 83b169253c920604afeddd5f3ecd9b9317e97b86f19c091463039d13de9d0ebc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. The document body, though heavily obfuscated, contains text related to 'cursos de ingles para niños gratis pdf' and the malicious URL, suggesting a lure for users seeking free educational materials. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious redirector.

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=cursos+de+ingles+para+ni%25C3%25B1os+gratis+pdf
    • http://files.indypendentnetwork.com/uploads/1/3/1/6/131637553/daxekebapibanot.pdf
    • http://files.thecococouture.com/uploads/1/3/0/7/130776514/5162638.pdf
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdf
    • http://files.puppyloveplaydates.com/uploads/1/3/1/4/131453645/wuvamurafemesiwuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/rovulurutadizareb.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/ximosalusafivip.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/lajaberikuvubonewakiwali.pdf
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/makkar_ielts_writing_task_2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/24236832831.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/72495625158.pdf
    • https://cdn.shopify.com/s/files/1/0439/4418/1928/files/kirarufolejivasutunol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/sukodabafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/wiwudekenekemelanav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0642/7289/files/56386972553.pdf
    • https://cdn.shopify.com/s/files/1/0433/8604/4570/files/31027097639.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/lojemuzisowepafifupuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/50704692949.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_off000066d1.bin
ecf98e0c071e0a8b8ad0768110d62642f25685d81cd889078a0424e65cab5ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D1 5328 bytes
font_01_sfnt_off000078bc.bin
deb7a7ba64e1e299157dd248a104128239f467d6c939d9ae291cc49d44c6e1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 11340 bytes

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