Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ac3b8b5a45efe4…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 20:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c3a8231e14e00bcc180f101af6a2b2b SHA-1: 6f201c13b837913cb4eba1cf4a983cbf94719bec SHA-256: 61ac3b8b5a45efe49bcd3a1557db6734194bb238adc78ff30279ebf3f672ba0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, includes text related to an exam answer key, likely a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.ru/pify?keyword=hcu+entrance+exam+2017+answer+key
    • http://files.msportsnet.com/uploads/1/3/1/3/131398372/8151312.pdf
    • http://sinemefo.mapokoresearch.com/uploads/1/3/1/0/131070874/6648494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/xbox_one_controller_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/revolamilimovulexonawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/catalogo_unidad_de_medida_sat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/49409274560.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/36779663790.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/gililejabulusiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/census_research_method.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/stet_bihar_previous_year_question_paper.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_off00006082.bin
219bfcc90a78b219bdc8204f494fedbeaeadba93a484db86a84de7f40e620b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6082 5604 bytes
font_01_sfnt_off00007398.bin
71acde62652335bb5cef014eba38afc297825af42e7f489e143de1901dad60bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7398 9880 bytes

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