Malicious PDF — malware analysis report

Static analysis result for SHA-256 9676d382927b0004…

MALICIOUS

PDF

32.6 KB Created: 2021-07-20 12:01:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a4336035738db5c88aa05b1b3b698be8 SHA-1: b98b51a3777765e821002bd2bd9406067f548dd1 SHA-256: 9676d382927b0004be254fbd94a9982c06d48ec24bc6e706da2a79cdc2cb91d4
180 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free generators'. The primary link, http://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-on-phone-game-hack, is identified as a malicious redirector. The document body and embedded links suggest a lure for users seeking in-game currency or cheats, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-on-phone-game-hack In PDF document text
    • http://www.taxiaparis.fr/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/blox-land-free-robux_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
font_00_sfnt_off00002aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACA 21940 bytes
SHA-256: 44b9771c4e0caa39a292a11db568f82d00aaf5f1ecc4cfcb2453892ce972b4c8
font_01_sfnt_off00005af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF5 19096 bytes
SHA-256: f8e74fa4b968a16dd44a94031ef99ed5be14016bd7b993395bbd98667463fda9

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