Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c5c19e79ff1d2a…

MALICIOUS

PDF

45.2 KB Created: 2021-06-02 22:54:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b069396127cf2cd5e61b1a335d01259e SHA-1: bed4bc1bd2c4fabbbed9d2ebaa533c8720d68cda SHA-256: 28c5c19e79ff1d2a05d8e2c498109c2a36e01774e3623d437f773771b83ca310
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though heavily obfuscated, contains similar themes and a primary redirect URL. The presence of these lures and the ML classifier's high confidence indicate a malicious intent to direct users to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.xyz/app/431946152/how-to-get-money-on-roblox-a-hack-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/all-of-the-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/is-there-a-way-to-get-minecraft-for-free_GM479516143.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_off00005337.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5337 24844 bytes
SHA-256: 8f095859f485c21aa2ca87c854dab2e20652af9fc064010059f8b493ffb64483
font_01_sfnt_off00008c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4D 18828 bytes
SHA-256: 8f1d57abdca96ed7eca982918dfe4e2d8fd63b45a604626aa0320abdfe6e24c4

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