Malicious PDF — malware analysis report

Static analysis result for SHA-256 9132df79d0d0f114…

MALICIOUS

PDF

42.5 KB Created: 2021-05-30 18:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 11f1a39bed70e7356c552342161256a3 SHA-1: a717314601ef5ceec1714ecb7755261aec3829f0 SHA-256: 9132df79d0d0f114555bae17fa7192b14b2d16f317fd8b218aff338fe795d504
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The document body and embedded URLs strongly suggest a phishing or scam attempt to lure users to malicious websites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/free-ways-to-get-robux-game-hack In PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/free-tiktok-app_GM835599320.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://www.dhi.edu.gh/wp-content/uploads/fsqm-files/coin-master-free-2021-spin-link_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_off000042f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42F8 27472 bytes
SHA-256: ecfcafa8048d1f0d7e9f481f38a6cf49ac5a1c24c8675505513db9f9ece9a748
font_01_sfnt_off0000828f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828F 18724 bytes
SHA-256: 4748f019d46a9554f00c7c8cf9bb59ec204dfb95bc520e2d25b5a7c8ef81b270

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