Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44527a4740a0679…

MALICIOUS

PDF

48.2 KB Created: 2021-05-13 20:09:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 783f052125d30344f67bace82341c3a9 SHA-1: ce49d452359c29fef5b8ed7fd581610c7a831191 SHA-256: a44527a4740a0679bbb5aad7815f702a2d3a80f915877855872b8776f720be7a
260 Risk Score

Malware Insights

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

The PDF contains numerous links designed to redirect users to malicious infrastructure, masquerading as free game hacks. The document body and heuristics indicate a fake CAPTCHA or human verification prompt, likely intended to trick users into executing further malicious actions or downloading additional payloads. The presence of multiple redirector links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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-change-your-name-in-roblox-for-free-game-hack In PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000493a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493A 28776 bytes
SHA-256: 701dddca0609693a11ee8da70b245aa7450ddc781b8e3401da5aebc9385aa8a1
font_01_sfnt_off00008a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000977f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x977F 19356 bytes
SHA-256: f5fa8051516efdb430215c32221800eb8c82dc03f6476ac338efe693dcbf881c