Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd4deb4dfcece50…

MALICIOUS

PDF

36.1 KB Created: 2021-07-04 23:59:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 22db149f118282aa388ee5e2050e6ef1 SHA-1: 1bf196101a740ad1700e6091207632d6a3913dbb SHA-256: 9bd4deb4dfcece50c4a14e1cfaae66465389c80a275d7597f0027287a33af173
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a 'free generator / game hack'. The ML classifier also flagged this PDF with high confidence. The primary lure is the promise of free in-game currency or hacks, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/free-spins-coin-master-2021-game-hack In PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/roblox-free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/how-to-get-free-commends-on-roblox-innovation_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/hacks-de-pago-para-roblox_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/get-free-robux-on-roblox-app_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/oprewards-robux-free_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/generator-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/roblox-gmes-were-their-isa-in-game-money-cheat_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/clone-tycoon-2-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/name-that-youtuber-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/free-robux-hck_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/how-to-hack-the-livind-dead-roblox_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/roblox-counterblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/always-day-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/unlimited-robux-level-hack_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/roblox-play-for-free-no-sign-up_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/roblox-bandana-free_GM431946152.pdfIn PDF document text
    • https://www.ekbm.ma-almasyhur.sch.id/__statics/gudangsoal/files/www-free-robux-eu_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_002_off0000332b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x332B 24108 bytes
SHA-256: 272554897f256f2dd1a70ef2c6264a2184f789d48a267ce588d76239f84bc4df
font_01_sfnt_off000069b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B5 18576 bytes
SHA-256: 461056571ca453647e3c969961301e9f27cf934f5ba6ca99c4dfe7c56792b440

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