Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2400b53dce2ac0d…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 07:59:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b44f308176a0bfac1e31daaa21f815a3 SHA-1: af87489f61c7d74ff23e819a91ed4849e693487d SHA-256: d2400b53dce2ac0d5aa1437b9887bf8fd03d6c48120cb57d43c778823da3be22
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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
  • 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.tw/app/431946152/roblox-heist-2-cheat-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-london-map-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-dungeon-quest-free-upgrades_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-nike-pants-for-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/monney-hack-for-royall-high-schol-roblox_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_004_off000051a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A4 25112 bytes
SHA-256: 868f52d21204f784cf2157facb8a291968862bdf4667868256e9652cf6671dc5
font_01_sfnt_off00008bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 18524 bytes
SHA-256: 053f6102eacde767f0afcd8248d111c07cde44de277a2616428d4c392bbb6eee

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