Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa05ac874e7196ff…

MALICIOUS

PDF

52.0 KB Created: 2021-06-11 00:45:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1440aa8bd50bd67200189c2ddd7064ec SHA-1: 606ab4ce8dfc61a55705fd8cbc9a14c8f4c7ece8 SHA-256: aa05ac874e7196ff3ad82bc157ef84d78ce8185eee9ce23ab3ae643d81d0e1f2
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a redirector lure, specifically mentioning a 'free generator / game hack' and a fake CAPTCHA prompt. The document body and embedded URLs reinforce this, pointing towards a malicious redirector infrastructure. While no scripts were extracted, the presence of a fake CAPTCHA suggests an attempt to trick the user into executing further actions, potentially leading to a second-stage payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.tw/app/431946152/roblox-hack-without-downloading-apps-game-hack In PDF document text
    • http://lib.untad.ac.id//repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/youtube-robux-hack-html_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-website_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-support-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E82 27288 bytes
SHA-256: ae264119797116e044e69c690d30ce4794858a54855f0ad3cf54eb4b0a7941ce
font_01_sfnt_off00008c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C75 2948 bytes
SHA-256: 300789a825ee177444bc8c8fc1db9ffe747af685018fa692292617c3fff500cb
font_02_sfnt_off0000968d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x968D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA39F 19880 bytes
SHA-256: 15fdd872aa72be82fb0c27a733ceb4fa065f1107461ffa88775af702f186fcce

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