Malicious PDF — malware analysis report

Static analysis result for SHA-256 996c892bac6b1be5…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 21:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7e21121ef808e4da34bb8c9bcf69d7ee SHA-1: 190646949033a5b07b0ca0178d4dd83da668b81a SHA-256: 996c892bac6b1be5353be21785813400c7369f76d7c554c9c9433cfc708d9184
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically impersonating Apple to lure users with a 'free Robux' or 'game hack' offer. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-redeem-codes-2021-game-hack, which is associated with known malicious redirectors. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a credential phishing or malware distribution attempt.

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/431946152/free-robux-redeem-codes-2021-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/free-robux-redeem-codes-2021-game-hack In PDF document text
    • https://3qblocks.com.tw/image/data/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/optifine-pe_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/wurst-hacks_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/ultimate-free-spins-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_off00004765.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4765 25368 bytes
SHA-256: 8f159b659fe90f0e3b29e72b6a53d91e032a01487785470f2939dfb54e1722a9
font_01_sfnt_off000082f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F9 18852 bytes
SHA-256: 835008e062f354a08c5cd285c30dce0b291468b55589a8f36d5d300bab70ed7b

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