Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e51d1f7f6779d3…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 08:05:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0d8696dcbf0a55bb994865e3bc21eddc SHA-1: 6a286d6562a372dce5ad74f402634e481ee0b526 SHA-256: a9e51d1f7f6779d3d9075cc4f99df72cd1da4c2963b271c877420adaaa14869d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The document body and heuristics indicate a lure to download or access external content, likely leading to further malware or scams. No scripts were extracted, but the embedded URLs and redirector findings strongly suggest a malicious workflow.

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/406889139/coin-master-hack-mod-apk-android-1-game-hack In PDF document text
    • http://installer-m.ru/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://installer-m.ru/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://installer-m.ru/images/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://installer-m.ru/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://installer-m.ru/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://installer-m.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://installer-m.ru/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://installer-m.ru/images/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://installer-m.ru/images/coin-master-website_GM406889139.pdfIn PDF document text
    • http://installer-m.ru/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://installer-m.ru/images/coin-master-hacks-android_GM406889139.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_off000048cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CC 26112 bytes
SHA-256: efa5db10c36429b0540b674c1983a15d6408c44074c7c51b86d2d70cedb36335
font_01_sfnt_off00008534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8534 18172 bytes
SHA-256: 6afee14d26951b5f7c24a7852f92ad66fc5e87cdfe243807a436cb7752adc1d3