Malicious PDF — malware analysis report

Static analysis result for SHA-256 99176ba48d13da55…

MALICIOUS

PDF

44.2 KB Created: 2021-06-09 07:12:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f2c421034e5c0ad816a3cb5d173fa7ff SHA-1: 8531dc647fd1f9aec39d5746c178d92db0af7fb4 SHA-256: 99176ba48d13da55d878d9400865d87bacc05f519e2ff329233293c07979a9de
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, specifically targeting users interested in game hacks and in-game currency. The document body, though heavily obfuscated, contains references to these lures and URLs. The primary attack pattern involves directing users to external sites that likely host further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.
  • 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/snip-hack-roblox-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-roblox-with-chrome-extensions_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-mm2-free-godly_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/https-www-roblox-com-games-2021202156-free-bux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-using-money_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-free-spin-link-in-coin-master_GM406889139.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/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/reddit-coin-master-free-spins_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
font_00_sfnt_off00005282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5282 24116 bytes
SHA-256: 4ce970113093bb09a918c0202a7da4d0f33bf0b3340dde8c239468bf0592b03d
font_01_sfnt_off0000896b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896B 18480 bytes
SHA-256: 765df9927fbbfdb17dccda4dbc9118e5af072844a66b2a0cae32a0fa6160f908

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