Malicious PDF — malware analysis report

Static analysis result for SHA-256 81195ef7bc3b5bc6…

MALICIOUS

PDF

43.8 KB Created: 2021-06-11 04:25:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4cbc6b132e95ece03c03804b946d903d SHA-1: 3be92a8789deaea9d5d06ce83234aca19b0955ce SHA-256: 81195ef7bc3b5bc69f904b9ed38b833cb9cdb7d495838553f0c77713af4fdb2d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to redirectors and SEO link farms, masquerading as game hack generators. The primary link, https://netcdn.tw/app/431946152/hack-pack-roblox-level-7-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs and text related to game exploits, reinforcing the lure. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or malware distribution attempt.

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.tw/app/431946152/hack-pack-roblox-level-7-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/how-too-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-any-hat-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/como-hackear-los-robux-de-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/como-tener-robux-gratis-sin-hack-ni-admin_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/descargar-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-no-humen-varucashe_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/breaking-point-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9A 25824 bytes
SHA-256: 578146d35508bbc61bbcc8d621f371f1be3b770d3607dc6169451387bc3de0b3
font_01_sfnt_off000087dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DD 18504 bytes
SHA-256: 782a74aa576aa25b57e89932b43d4305357b275e68b2a3a487efa96ff5cf30fb

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