Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22fb367ae65faec…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 22:21:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7d541e06b915098d9a41e25092f4476f SHA-1: ebf5589d4e25282c0b334fa2621651cbd0a62f2b SHA-256: d22fb367ae65faec27f5ebc285cc8397a26f9dde625388358b67312ee0f9c17a
200 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, masquerading as game hacks and free currency generators. It impersonates Microsoft to increase user trust, attempting to trick users into clicking the malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a high likelihood of further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-codes-game-hack.
  • 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.online/app/431946152/free-robux-codes-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-tiktok-25-likes_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/new-free-spins-coin-master_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
stream_004_off000052b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B8 24820 bytes
SHA-256: 816857a0ed7fd741603fb43f1d5fbe2df2253ee0a8930c76a51bb54f151f1666
font_01_sfnt_off00008bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off000095e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E0 18188 bytes
SHA-256: 7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3

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