Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8c51a6b6f5efe…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 02:15:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ef07cc93955828d397bcc39528cd28a8 SHA-1: 782085c318c8de7561598766b26aaa59180c62d5 SHA-256: f8d8c51a6b6f5efe58b3fe605ec86833731f855b168bbd37be098fb24f62a107
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as "free generator" or "game hack" lures. It also presents a fake CAPTCHA to trick users into interacting with the document, likely leading to further malicious content or downloads. The ML classifier strongly indicates maliciousness, and the embedded URLs are associated with known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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/free-robux-just-enter-username-game-hack In PDF document text
    • http://apx-centre.ru/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-coin-master-ios_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_off00004599.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4599 26840 bytes
SHA-256: a7d61014c8f0abd3da87faff794eeb6c11651848cddb37648c0759b4c9ecb19c
font_01_sfnt_off000082f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F7 18960 bytes
SHA-256: ad194f5984d8cbd7c817d1b512f86f024f40bf30beebdf7d12c6ff62fc849400

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