Malicious PDF — malware analysis report

Static analysis result for SHA-256 8077a7a3894876c6…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 19:55:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1276f4e6b2255437b6ba2ae7b22da86e SHA-1: 9a556d0a948333d5518d9267d1c195191b05e203 SHA-256: 8077a7a3894876c619f18998989e66f50bf8857fe5661163e7797d28c9e4012d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a game hack or free currency generator. The primary link, http://netcdn.tw/app/406889139/coin-master-2021-free-spins-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a scam related to popular mobile games and virtual currency. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly indicate a phishing or scam attempt.

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/coin-master-2021-free-spins-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-free-500-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/best-free-thumbnail-maker-for-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-bc-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/cheat-roblox-aimbot_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/pokemon-brick-bronze-roblox-hack-phone_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-game-hack-commands_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/tiktok-free-stuff_GM835599320.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-free-robux-banana-website_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/mask-free-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/tp-hacks-for-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_002_off00002e1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E1B 22128 bytes
SHA-256: ffceee7e6a22c2c7abcee3a4530f90d045e1cff54baf21f109fa7d2287077572
font_01_sfnt_off00005f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 18576 bytes
SHA-256: 35e5f20b05e6bdeb821d9650870183b7a7c1f79b7df8c2ba0d9c963e0c273a4f

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