Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ff158d40999b88…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 21:01:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 657604a913eeea1a67309d33f17c1277 SHA-1: e210ddb1c93f869e447a8bd055413c5b866520c6 SHA-256: c4ff158d40999b8882e0ed1b728de52e97e86b7dfdf488eb89db6e6c110089a1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/cheats-pet-simulator-roblox-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/executer-command-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-page-no-human-verifaction-no-surves-no-email_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/comoponerse-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-download-no-virus_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-free-hair-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/script-cheat-roblox-mad-city_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_off00002f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F17 22628 bytes
SHA-256: ba775c15f99511a062ddf40eef36dfb930655ccedcaba6b4023b413585780bd5
font_01_sfnt_off000060e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 19428 bytes
SHA-256: f4c4c8e0ece7f3aed2009fb67d48628da0677b8bbdaf9fda14956357fd6174fd

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