Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcd4a99c84f557a…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 13:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ed88b2022c9184f3533b5f74081fa7e SHA-1: 54213071301aec5244bef9e8b857bababdcda99a SHA-256: 5dcd4a99c84f557ac3bef025fa9c700b1cc7ad3105ee4e52a2ab6815a5c74295
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=autoimmune+gastritis+treatment+pdf'. The document also exhibits characteristics of a link farm, containing numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=autoimmune+gastritis+treatment+pdf
    • http://files.blossomvalleysingers.org/uploads/1/3/1/8/131871593/2531817.pdf
    • http://files.dunlapsrestaurant.com/uploads/1/3/1/3/131379832/bineno_fodos.pdf
    • http://files.foursideddesign.com/uploads/1/3/1/3/131379706/furelijeti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/malisis_doors_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0448/4897/1938/files/fusionner_des_fichier_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0450/2949/0838/files/questes_de_associao_de_capacitores.pdf
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/potibim.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/apexogenesis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/50738804738.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/transpose_data_frame_r.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2571/files/income_tax_calculation_statement_for_the_financial_year_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7701/files/susijo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/pasevatuworumarug.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/xifekobobugab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/animal_sounds_names.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_off0000610a.bin
4e79e710c64679273561c87a895544976bf18102821ec6057fd270b2aa1074cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610A 5320 bytes
font_01_sfnt_off00007306.bin
3290e98918fe53d49a7e56a975f5595dc697a6256182e5a42fc3e962da4f44be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 9600 bytes

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