Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a9248efe9d6a6d…

MALICIOUS

PDF

45.0 KB Created: 2020-08-10 21:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b402fbb8ddd6053f60678334d7cca52 SHA-1: 7cf72436593e9ee1fb6fefa6d7a147daa08e1d89 SHA-256: 13a9248efe9d6a6dad7e1592945d7648e003bfa68d8f18f2b173d3fbd84127a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=bronconeumon%25C3%25ADa+en+ni%25C3%25B1os+pdf, suggesting a phishing or malware distribution attempt. The document body itself is heavily obfuscated but contains references to the redirector URL and other PDF files.

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=bronconeumon%25C3%25ADa+en+ni%25C3%25B1os+pdf
    • http://files.theorlandorealtor.com/uploads/1/3/1/3/131382239/23662512.pdf
    • http://jebor.act-cism.org.au/uploads/1/3/1/4/131408970/2487069.pdf
    • http://zifok.visionlighting-inc.com/uploads/1/3/1/4/131406893/pixagobogotidalumaf.pdf
    • http://files.berryessahoa.com/uploads/1/3/1/4/131438616/valojixarofagisaj.pdf
    • http://files.elilanguagemagazines.com/uploads/1/3/2/3/132303077/8871367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/5029/9555/files/transfer_google_authenticator.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/chemistry_notes_for_class_12_free_download_up_board.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/75308715021.pdf
    • https://cdn.shopify.com/s/files/1/0438/1406/0189/files/84849021233.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/25757386029.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/visual_storytelling.pdf
    • https://cdn.shopify.com/s/files/1/0435/6774/3139/files/jee_main_2020_online_question_paper_with_solution_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3590/files/ronokenanarom.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/first_class_properties.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/gogujika.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/89510587788.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_off00006e8d.bin
2bfdc3579101dd1f45aa8d663fa6db9c081842540e5f1403292465f6ff8c24b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8D 5584 bytes
font_01_sfnt_off0000812d.bin
514420772af0245629e9c2a6705f89ee1aef3e0d89cb8645983df6a6e8d874c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812D 10952 bytes

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