Malicious PDF — malware analysis report

Static analysis result for SHA-256 763d0b40ddc0db98…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 03:01:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c20a76f90f81baaaafe0af673c65cb5 SHA-1: 7577314918dbd80e8d808d5fe010eab6f69812f3 SHA-256: 763d0b40ddc0db98d145f2f7ffc51280aaf8a41c33b4052f191267aca795b73e
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "game hacks" or "free generators". The document body and heuristics indicate a lure for users to click these links, which likely leads to the download of a second-stage payload. The presence of a password instruction suggests an attempt to bypass gateway security by encrypting the payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/hackear-coin-master-sin-verificacion-game-hack In PDF document text
    • http://daskrimti-jabar.web.id/library//repository/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-dog-roblox_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/are-decals-free-to-upload-roblox_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-roblox-acc-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-no-verification-no-password_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/5-robux-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/is-nexusus-roblox-hack-safe_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/https-wwwrobloxcom-games-202120216-galaxy-hacks_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-premium-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-free-robux-mkd-apk_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-welcome-to-bloxburg-cheat_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-coin-master-cheats_GM406889139.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_002_off000030c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C2 23296 bytes
SHA-256: 685364ff134e0232cdc554eebeac5e2244cd2f1392136375b5d9486c1a43c33c
font_01_sfnt_off00006560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 18140 bytes
SHA-256: 8725758669e843fa1a0d8f2b6ab2819d9373ecf6755463d2002cda75c39f467b

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