Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f433cea44f2759…

MALICIOUS

PDF

45.8 KB Created: 2021-05-16 00:15:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 90f86cc8a6e4c10ed18beb478f99939f SHA-1: 6b3bdc88fa5f6a097c3ccf0b3abc1cf8beb1dbc4 SHA-256: a0f433cea44f2759c4b1cc5c209b26ce3fb76ebbb19059a1b5b6862c4ba3e845
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking links. The links lead to malicious redirectors and a large number of SEO-optimized PDF files, suggesting a campaign to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious, reinforcing the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/earn-robux-now-game-hack In PDF document text
    • http://jbtlive.com/assets/CKImages/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/moon-active-games_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/collect-robux_GM431946152.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jbtlive.com/assets/CKImages/files/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004968.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4968 26232 bytes
SHA-256: 6fc6ebba3f2fb1b4504c078c8137c37838941ad2d2861b16483c50971a75cb9c
font_01_sfnt_off0000865a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9045 18244 bytes
SHA-256: c4f4d96dd4ae320374aba47736520dcd557f712ab2f623cefa09a16c6934ef42

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