Malicious PDF — malware analysis report

Static analysis result for SHA-256 af50b7d550fbb810…

MALICIOUS

PDF

40.1 KB Created: 2020-10-05 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2768333cceb48d37c638f3e536740509 SHA-1: 67712d4d4402e70df6796127cdd476b26fcb4cf5 SHA-256: af50b7d550fbb8104c9bd035521835fbc2a1e0dbea91c72c7207d52d81058759
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL.

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://gettraff.ru/pify?keyword=thaumcraft+crimson+cult+portal In PDF document text
    • http://jovobo.moccasinsbytrena.com/uploads/1/3/1/3/131384055/762ea851dd8.pdfIn PDF document text
    • http://files.njaszn.com/uploads/1/3/1/4/131406885/zobigedokapegefutuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8985/7174/files/speeding_ticket_explanation_letter_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1182/0698/files/halo_1_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9725/0205/files/91984813032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3542/1593/files/himno_de_puerto_rico_cantado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2865/4491/files/tusidadezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab17c5f-039e-4ff3-a51a-9057d0911388/13311407316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23bdffca-f995-46e1-a978-272b93de4c14/52718099597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07cb9d3-6d2e-442a-b846-7b699f794165/wilixuwakudunatirugurowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484eadd2-1825-4c97-9fa1-4eb32d448296/gisudunitobaguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79d3dea-85c4-440c-8cd7-e937192c75e0/7354633415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2729/1542/files/dollar_general_district_manager_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0724/5988/files/30565955226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9965/9176/files/tobalimelurepufafodunuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6528/6564/files/webaxefodojix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2860/5860/files/twig_christmas_tree_with_lights_on_wall.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601E 5204 bytes
SHA-256: fa5768094454eacd58eb8cd9f37404c795b98510960310ffe4a42e96d12635a5
font_01_sfnt_off000071a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 9952 bytes
SHA-256: f5674fe2f09a970ddb85ec42d2de8b628d4904f147f39ef710a5eb44100d8a36

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