Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2074237e161602…

MALICIOUS

PDF

49.8 KB Created: 2021-06-11 09:23:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc3e356e148e1a3d6d6bd28fd05920bb SHA-1: 6ec6a4fa488ada3857fad51669bc3f0b9ebbc0f5 SHA-256: ac2074237e161602da8f1f2679d192a173c3fcba8519f2631c56e268db25e939
200 Risk Score

Malware Insights

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

This PDF document is designed as a lure, impersonating the Apple brand to entice users with promises of free game hacks or currency. It contains a malicious link that redirects to a known malicious infrastructure, likely to download a second-stage payload or lead to credential harvesting. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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: https://netcdn.tw/app/431946152/roblox-hack-no-survey-or-human-verification-or-offers-game-hack.
  • 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.tw/app/431946152/roblox-hack-no-survey-or-human-verification-or-offers-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hacks-roblox-car-radio-codes_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-pokeballs-in-pokemon-go-2021_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hack-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-ebooks_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-gea_GM431946152.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_004_off00005077.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5077 29932 bytes
SHA-256: 4747a47b72b39ed8f7e23e2c5eff44beaa1d8bfb8bba8cb4ec71da2a336d475b
font_01_sfnt_off000092f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F7 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00009d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D22 19232 bytes
SHA-256: 93ce7d1aefd1dfa81c9dc71ab913e9dde81fb9b45fcecb7ab076c861f81d209c

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