Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c4e4bc181bcc6a…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 12:11:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 417fed76d8cd208bab6bf7e2e5f39869 SHA-1: 4e3cafaac9d955cc3123056ae3dd1b59c60d2cd0 SHA-256: 49c4e4bc181bcc6a1ff7282a3ad84d9cb673b0c0139af94d38dec0cab018dd99
260 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are SEO-optimized for game-related cheats and currency. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is displayed, likely to trick users into clicking these malicious links. The primary link leads to a known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/roblox-premium-free-game-hack In PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/master-free-spin_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/free-roblox-usernames-and-passwords_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
stream_003_off00004a5b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A5B 27488 bytes
SHA-256: 389cd086bee069bb1e466ea67b6455fd7fe6246c55e5408f48f62e207c382708
font_01_sfnt_off000087e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E7 18620 bytes
SHA-256: 29b072d58d5b3a55b665a3fffae90f40690866f16f9b518bc51084b043f759b6

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