Malicious PDF — malware analysis report

Static analysis result for SHA-256 229332da304f2bc3…

MALICIOUS

PDF

41.3 KB Created: 2021-05-13 10:34:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 39b2edb67d09808e1c2978421938b3df SHA-1: 7dc0ee72b83e6162714c8a58a019e6727993f825 SHA-256: 229332da304f2bc3c7d58c69ebbe3c1a56e86f76ea097f4a3938acfd4c8696cf
220 Risk Score

Malware Insights

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

This PDF document contains a malicious redirector link disguised as a "free generator / game hack" lure, further enhanced by a fake CAPTCHA prompt to trick users into interaction. The document body and embedded URLs suggest a social engineering attempt to drive traffic to potentially malicious websites. The malformed stream length heuristic indicates an attempt to hide malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-no-human-verification-game-hack In PDF document text
    • http://gamixpaliwa.pl/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/robux-sites_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-minecraft-printables_GM479516143.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_off0000473c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x473C 23756 bytes
SHA-256: ee9129c564e05e9b71153da9a0ffd326804b653957e87e21af3c64a3015a1ef6
font_01_sfnt_off00007d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 18860 bytes
SHA-256: 7bf6b254896799c3550cbaf8339a45bd8c79022df116fd793fc899e49cde55bc

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