Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3962a806d6ad630…

MALICIOUS

PDF

40.2 KB Created: 2020-08-05 13:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2130f00ec4e30413e60ebf2d1027e931 SHA-1: 2f541a182ebc30520b9aab3a9eaf0bd358e55446 SHA-256: a3962a806d6ad630232edc51eb01398aa30cd1bdd9f28a25dd46844d900f3afa
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.cc' which is disguised as an educational resource. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other links that appear to be part of a link farm designed to improve search engine ranking for 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=ncert+biology+book+pdf+class+11
    • http://files.carbonprecision.com/uploads/1/3/2/6/132695575/mivinase_pekugiv_togoji_siwoxifamaredo.pdf
    • http://files.epsilonengineer.com/uploads/1/3/1/1/131163761/xadekugi_tamutibine_fedesuguwopekus.pdf
    • http://files.rarebirdediting.com/uploads/1/3/0/9/130969148/lasojojuma-tevuxivuworefo-vumami-wabojofowigoju.pdf
    • http://files.peacocksprettys.net/uploads/1/3/0/7/130738681/jejazojudimavenebuli.pdf
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/33226622494.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/momagulober.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4246/files/frecuencia_cardiaca_tecnica.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/selling_skills_assessment_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/60648130489.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/patient_care_technician_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/affective_computing_rosalind_picard.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/ti_nspire_programming_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/13989160820.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/22179589964.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_off00005ea4.bin
88464d7bcee4b76e1e6cbb2fe491334d51fe9fe6469cbdf51051423bab529221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 5648 bytes
font_01_sfnt_off000071fb.bin
c59a07d9b8d11ac06dc6f89df48689140a737088a59c039424f08ea215f71b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FB 9980 bytes

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