Malicious PDF — malware analysis report

Static analysis result for SHA-256 123f672fabbd89e0…

MALICIOUS

PDF

42.9 KB Created: 2021-05-13 07:03:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 72401e136af5fc351779180f80377d26 SHA-1: cf440c2720f0fd7309dbd60e566d35ccc4b7fe8e SHA-256: 123f672fabbd89e04b5a736ba3e898f77608c0e414bbb0ee1900170017112afb
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is designed to trick users into clicking malicious links by presenting a fake CAPTCHA and a "free generator" lure. The document also contains heuristics indicating it requests recovery secrets, such as private keys or passwords, which is a high-risk activity. The embedded URL points to known malicious redirector infrastructure, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/coin-master-free-spins-link-2021-april-game-hack In PDF document text
    • http://battistibrothers.com/system/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/mc-hacks_GM479516143.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/real-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/master-coin-free-spin_GM406889139.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_003_off000049c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C0 25380 bytes
SHA-256: 4b42cb088158bb57144aef8541f5bea9d252f86a378fcd74825e9ff247c144f9
font_01_sfnt_off0000849e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849E 18532 bytes
SHA-256: 552a781c635be2f1783b3430facdc17a6d9e208cae7d98c52d6673c33e385b16

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