Malicious PDF — malware analysis report

Static analysis result for SHA-256 883c4d722dd6c17e…

MALICIOUS

PDF

44.8 KB Created: 2021-05-12 10:31:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 76068cfefe8eb15521d2ae1a1cc8802a SHA-1: f98ebfbcd435e2ba8fcaf8acaaf50a0953905153 SHA-256: 883c4d722dd6c17e07aea5ee0115d7dac13a9e823f0a2d9bc7ea96be82bad5dd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'free spins'. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly suggests these links are intended to deceive users into visiting malicious sites. The presence of embedded URLs and the ML classification further support a malicious intent, likely to redirect users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/406889139/coin-master-latest-version-hack-game-hack PDF link annotation
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://elearning.ma-malnupusatmenes.sch.id/__statics/gudangsoal/files/coin-master-email-rewards_GM406889139.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_003_off00004cdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CDB 24092 bytes
SHA-256: 0ee36ae2c1889536473df6305b3afe8ac004ff12d37e71369b4d37bb9fb68b05
font_01_sfnt_off000083e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD2 17848 bytes
SHA-256: e6a541bb9d0fa392ff7c4dd8c6fe04cfd1564a102b60f3b8f3e9956a20f70d19

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