Malicious PDF — malware analysis report

Static analysis result for SHA-256 7238a7d5fe04d65a…

MALICIOUS

PDF

250.2 KB Created: 2021-07-06 08:45:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aa0cf2588779e2a5796a77069519635c SHA-1: f11cec2510eefcd4c4961bedf419312ac8da946e SHA-256: 7238a7d5fe04d65ab760892c164bf11a5f048666f9c8686017a421b1974e0bd4
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1555.003 Credentials from Web Prompts

The PDF contains multiple heuristics indicating a credential phishing and redirection lure, specifically mentioning a fake CAPTCHA and MFA harvesting. The embedded URL 'http://netcdn.tw/app/1330123889/pubg-uc-generator-game-hack' is associated with malicious redirectors and impersonates brands. The document body, though heavily obfuscated, contains references to game hacks and generators, aligning with the lure tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-generator-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-generator-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-download_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free4mobile-info-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-cheat-com_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-injector-dll_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-no-virus_GM431946152.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_024_off00037bfe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37BFE 26028 bytes
SHA-256: 6b4ffa18855f5d25d10f661593c5294a2c1290cbaeaa4f654bc5756930e07c0c
font_01_sfnt_off0003b948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B948 18372 bytes
SHA-256: 9980b5e755496f1ad5c82c180133023f3920cc623d4c808bb1b07302dd3a4e1b

Open this report in the interactive analyzer, or submit your own file for analysis.