Malicious PDF — malware analysis report

Static analysis result for SHA-256 1990986961eee19b…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 06:37:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3c7bf4155ded9f7f28bfedf9ab45575e SHA-1: e5ca658baa731f839e0f13d4b2dd350c7486a848 SHA-256: 1990986961eee19bd214dd9c48a96f1ee6ed5a4bff9e6c59f3c4d8658302057a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector for a 'game hack' lure. The document body and heuristics indicate a deceptive attempt to trick users into downloading content, likely a second-stage payload. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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
  • 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://netcdn.online/app/406889139/100-free-spins-for-coin-master-2021-game-hack In PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/tiktok-free-song_GM835599320.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005166.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5166 24248 bytes
SHA-256: 4a81720b5b8bd275569362e59168897b6289bd3e8e4a74460252db6ef8e47de9
font_01_sfnt_off0000892f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892F 18288 bytes
SHA-256: 7a7785de19adfa5a65cd79b10bfe31691e1cdc7f9f712964e30bbfe58da4eef2

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