Malicious PDF — malware analysis report

Static analysis result for SHA-256 663bb443a81d7e5e…

MALICIOUS

PDF

46.2 KB Created: 2020-10-27 15:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 041c2e11b1590d06fe2279313df8c369 SHA-1: 69e72c9e2c83ae77399a076ba4b49b3e2e03962f SHA-256: 663bb443a81d7e5ef44769d00e58503dd447d2beefe64009a8eb7282a6aeb651
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL that attempts to lure users into downloading TeamViewer. The document body also contains a direct reference to this URL and a call-to-action phrase, indicating a phishing attempt to trick users into downloading potentially unwanted software. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=teamviewer+11+apk+free+download In PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/bivuzijerojojofo.pdfIn PDF document text
    • https://segelibuvak.weebly.com/uploads/1/3/4/4/134451144/tetikuxena.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/fojateb.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/judojeka.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/pusarudapiza_salokugeboge_wetun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f874920cb3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f97be23d7aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f8b7966e9073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8736c98c65f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f9129a71f38e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5f9745d1250e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f8e81b35efc6.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/1/0499/9331/8550/files/lojekijakowugowirurutixes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3251/8049/files/heart_failure_guidelines_acc_aha.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/red_dead_redemption_2_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbab0bf-4c64-4de0-9ea7-8fa718890b7b/zovatowewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32622b7-dff3-4eff-9064-3296ad392431/xatisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157a1212-7cce-424c-b487-39b383dca1bf/hummel_trumpet_concerto_in_e_flat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb9a2ab-d28e-48b2-8f4a-99fd2714acf7/roderanunuxasuweginu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2febf34b-b709-44be-a4f1-215d1db73378/computer_security_principles_and_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12deacb5-d03e-4ab8-95a6-d78057e6799d/58186096694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c890389f-3fdc-4a0e-b19f-3ecca10bb3a0/vewaranixusarewexexuzem.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_off00007431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 5224 bytes
SHA-256: 30b1e3f5063dbd88d0deb3935c1e0d0fd9de71f616bf6350fca2b5554f7aa720
font_01_sfnt_off000085fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FD 11144 bytes
SHA-256: acf918aafde0dedd2d0982b923987cd04e796939523af80f3f4f7b0645724f13