Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dc6e90f2e02e3d…

MALICIOUS

PDF

42.3 KB Created: 2021-05-11 03:32:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b481885af7846ed668aba7eb64c67ac4 SHA-1: 3418ed8c3564088175c337916ecb42c773bf52d6 SHA-256: 19dc6e90f2e02e3daaeb6c5acb6c61e2bcdf721a9c73af013cba2a166dc58708
260 Risk Score

Malware Insights

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

This PDF document contains multiple links to potentially malicious websites, including a redirector disguised as a 'free generator / game hack'. The document also presents a fake CAPTCHA or human verification prompt to trick users into interacting with these links. The presence of numerous SEO-optimized PDF links suggests a link farm designed to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-promo-codes-roblox-game-hack In PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/i-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://discordIn 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_off000047d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47D8 25464 bytes
SHA-256: ad5b98ea5dea1fe9b37530c52f619ab24e8f327fc781e282c32a290c37b288da
font_01_sfnt_off0000822c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822C 18536 bytes
SHA-256: ef80caca2854abdf9bf8720e52e386ee010a7b90d5614c403206ff018aea8f70

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