Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1f818f7fe5bde2…

MALICIOUS

PDF

45.6 KB Created: 2020-11-03 16:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 60f5b77d87f90936c915d8f21cd8c0cf SHA-1: 76c1408bc1305a4529f71b397365a804dfe5df52 SHA-256: 8c1f818f7fe5bde2a27066213c17aa380a830aa8d5357ac2960c06035b9111d8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a 'Cornell notes template free pdf'. The embedded URL `https://cctraff.ru/123?keyword=cornell+notes+template+free+pdf` is a primary indicator of malicious intent. Additionally, the PDF hosts a link farm pointing to other PDFs, suggesting SEO poisoning or a similar distribution tactic. The ML classifier strongly flagged this PDF as malicious.

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://cctraff.ru/123?keyword=cornell+notes+template+free+pdf In PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/7df2bd0fb07b.pdfIn PDF document text
    • https://bigubuwona.weebly.com/uploads/1/3/4/3/134309174/07583003c71ee.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/2219732.pdfIn PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/0ebb14146bf.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/ea11310661c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/bopexunafamaxilesubexe.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/zippo_hand_warmer_power_bank.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/gevinomogu.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/22421588198.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/fasivuzuledod.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/penojavasasewulonewo.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/how_to_chair_an_aa_meditation_meeting.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/vusemebodiredopunifile.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_off0000750f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750F 5092 bytes
SHA-256: 01f2d1f1019a3be6f8a73ce54e7f8cde13e0470b63e1d8bb8970a3d4dcf91e6c
font_01_sfnt_off0000863f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863F 10304 bytes
SHA-256: 62866121bfd67b07d266ac9f6f342553a1f4ea90eb6a462253d8d356e4272b3b

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