Malicious PDF — malware analysis report

Static analysis result for SHA-256 9476aa4cf752985f…

MALICIOUS

PDF

46.9 KB Created: 2021-05-15 05:44:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2191b5345192fc9cce9b8c4cfd61d48d SHA-1: a9de072258a0dde148984e37ae1c17174fc9d58f SHA-256: 9476aa4cf752985fe39c8c599e1f7a259b01462fbe799ec455914be900b2b55b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The document body and embedded URLs indicate a lure for users seeking in-game advantages, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious, increasing confidence in the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/free-robux-just-enter-username-and-password-game-hack In PDF document text
    • http://grugliascogiovani.org/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/robux-app_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2C 24704 bytes
SHA-256: fb513e159e749b383d535a1f2b4724703d147003dc264e487405ad748e1f34b4
font_01_sfnt_off000084ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9192 19448 bytes
SHA-256: 4f9e120e202de6bc84ec177104ad4fa84abe9ff586f44aa7e03787aebbe4e81a