Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7812b4d23523cf…

MALICIOUS

PDF

42.5 KB Created: 2021-05-17 01:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cb9d556c667cff5cc8b488e2eea12104 SHA-1: 094422f84af9cc9107cb01287a67d431d1d30f88 SHA-256: ea7812b4d23523cf61c7c91b553b9841bc26e040f0328f504ad57066740accea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL identified is https://netcdn.xyz/app/431946152/complete-offers-for-robux-game-hack. This pattern suggests the document is designed to trick users into visiting potentially harmful websites, likely for further malware delivery or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/complete-offers-for-robux-game-hack In PDF document text
    • http://wsit.at/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://wsit.at/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://wsit.at/images/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://wsit.at/images/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://wsit.at/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://wsit.at/images/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://wsit.at/images/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://wsit.at/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://wsit.at/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://wsit.at/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://wsit.at/images/gain-robux_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_003_off000046d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D7 26120 bytes
SHA-256: a486d17352314f194a7201fba93aac1515f3c44714f1df05a17ae5098516f97b
font_01_sfnt_off000082ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AC 18628 bytes
SHA-256: 27a538390e2791e01883ed63320744732627358ab115b0534bac8ed790d0f8b6

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