Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1042e98b6b4f456…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 09:45:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7557c3df7cf9beef2f09271445fc0c45 SHA-1: 65415c82e32dc223a1f78f639e36b38d73256083 SHA-256: e1042e98b6b4f4562dd1040558ad46bef262b5c1480ec1517b05438eabec13a8
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which redirects to a malicious website. This website is associated with 'free generator' and 'game hack' scams, indicating a phishing or social engineering attack. The embedded URL, https://netcdn.online/app/431946152/claimrbx-free-robux-game-hack, is a primary indicator of this malicious redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • 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.online/app/431946152/claimrbx-free-robux-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/links-to-get-free-spins-on-coin-master_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_004_off00004eb2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB2 27220 bytes
SHA-256: b4b1b0187502e829e97731f6e7ac75bbccee608031265205d98a07795b3f62f7
font_01_sfnt_off00008d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D13 18696 bytes
SHA-256: cfa2fb642045145230a20b139508f2677ace4dfe3e3be0c8823c50af7163445a

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