Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9effde3efefe19…

MALICIOUS

PDF

46.1 KB Created: 2021-05-13 07:36:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bfe89b3301df14c8e49936abac67089d SHA-1: c27ef70b3bbf0c6ebcccded147262a2589bbd5de SHA-256: ff9effde3efefe192549ecd3a804f525afb4d6afc103e6d6120053212e06962d
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to malicious redirectors and impersonates Microsoft to lure users with offers of free Robux and game hacks. The document body, though heavily obfuscated, contains URLs that are likely used to download further malicious content or lead to credential harvesting pages. The presence of a fake CAPTCHA heuristic further suggests an attempt to trick the user into executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/blox-pink-robux-free-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/431946152/blox-pink-robux-free-game-hack In PDF document text
    • https://de-licht.com/image/data/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/master-8-ball-pool-free-coins_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_003_off00004aec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEC 26160 bytes
SHA-256: b188da82d7143ced94f66596a6a0c868b3f1c553d88499e147febacb6f45146c
font_01_sfnt_off0000876e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876E 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9109 18532 bytes
SHA-256: 83476c1cdc4965e32c1b031adf165cbdabd52b50c1595b7bdd37ea4d9a1aed4b

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