Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa1cb1bcc7db186…

MALICIOUS

PDF

41.4 KB Created: 2021-05-16 14:33:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3db7db710e33c8fdf57c3aff51b59c5a SHA-1: 86db3beb068f2931885b3462385885b934abc725 SHA-256: efa1cb1bcc7db18621d457fc21e8ab4c08a8ff62272acede29ed0f83ff03484e
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to redirectors and external sites, masquerading as game hacks or generators. The ML classifier and specific heuristics indicate a high likelihood of malicious intent, likely credential phishing or malware distribution. The embedded links, such as 'https://netcdn.xyz/app/479516143/minecraft-tiktok-hacks-game-hack', are designed to trick users into clicking by impersonating brands like Apple and promising free in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/minecraft-tiktok-hacks-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.xyz/app/479516143/minecraft-tiktok-hacks-game-hack In PDF document text
    • https://javisintlmedia.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://javisintlmedia.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/free-robux-real_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/robux-free-co_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://javisintlmedia.com/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://javisintlmedia.com/images/open-coin-master_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_off00004885.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4885 24996 bytes
SHA-256: 1d50717f9df50b4a2b9431d07cc3d34a0824c9d34c4fea8274c0c14e3646ae35
font_01_sfnt_off0000809b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809B 17880 bytes
SHA-256: d5bc1f00134bcbca17edb073a38cf34a4b8369625bcb3a8e6d2c090e6dde0fec

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