Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfe7009ae0b0e1f…

MALICIOUS

PDF

36.5 KB Created: 2021-07-06 11:50:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bb34f15a8ee6e19d5d24e6605f0d0442 SHA-1: 6f2d81b2d19eb56dbccfba58cb9224190d38e922 SHA-256: dbfe7009ae0b0e1f53f4e1690d01c596a66c8afedfbc853defe417bfe2d2f582
220 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users with promises of free in-game currency and hacks, specifically targeting Roblox. The primary link directs to a known malicious redirector infrastructure. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially malicious websites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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 http://netcdn.tw/app/431946152/get-free-robux-without-doing-anything-game-hack In PDF document text
    • https://library.univthamrinaka.com/repository/pagina-de-hack-de-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/como-hackear-vehicle-simulator-roblox-para-tener-12000000_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-hack-rebirth-in-ice-cream-simualtor_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/buy-stampycat-skin-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/can-you-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-change-you-name-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/moon-active_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/buy-robux-free-en-espaol_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-obc-and-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/como-utilizar-cheat-engine-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/face-png-roblox-free-face_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-no-human-verification-2021-ipad_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/giving-people-free-robux-livestream_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off00003614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3614 22444 bytes
SHA-256: bc48170cb56907d6e4e83f54110d66918ab330d2cdf9beded7ea1c483f39ade5
font_01_sfnt_off000067e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 19652 bytes
SHA-256: d01fab7bff865e1e572a69531771b19011470ec9dd60cfeb54f37c62aa9fdbeb

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