Malicious PDF — malware analysis report

Static analysis result for SHA-256 13493759399b00ba…

MALICIOUS

PDF

46.1 KB Created: 2020-08-28 10:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5377d96df8e259eb6155892854cb0da7 SHA-1: 9910d240316d681f93a01ab54f49d6b400f27f88 SHA-256: 13493759399b00ba51ede2f072c1c60424be31d20ba8dd67bfe19e480041fda9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.me/pify?keyword=quadern+de+valenci%25C3%25A0+elemental+pdf+solucionari. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains. The document body, though heavily corrupted, contains references to the redirector URL and other PDF files, suggesting a lure to download further content. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect users to harmful sites.

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.me/pify?keyword=quadern+de+valenci%25C3%25A0+elemental+pdf+solucionari
    • http://wezenuwak.sharintebo.com/uploads/1/3/1/6/131606457/539ac66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/ralamujusanabap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/wudaganoresikuwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/dogefodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/sujet_brevet_physique_chimie_pondichery_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/padulikijor.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/cascading_style_sheets_video_tutorial_free.pdf
    • https://cdn.shopify.com/s/files/1/0462/7372/4576/files/rokinuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/domain_name_system_in_computer_networks.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/12916633234.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8700/files/aadhar_card_password.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f86.bin
1502b783ad1069c1957fbdcb5b044e8d6a0f8956b972d35b448d240709e6ca18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F86 5540 bytes
font_01_sfnt_off000071b6.bin
e17f1e266f26b093002519f477b5804c727e57e7e55dae80d373140396ad72ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B6 14100 bytes
font_02_sfnt_off00009b56.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B56 4324 bytes

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