Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dcb561e5a9564c…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 22:51:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 596e4c133547a39c97604b54cda9c053 SHA-1: cd4fdddc80da20c22635f9aee3277a4c3994f918 SHA-256: 01dcb561e5a9564ca8cf172bda46eef4ee092b1b17f1ea6ffb60146408260655
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple critical heuristic firings indicating it links to malicious redirectors and a large number of SEO-optimized PDF links, all related to game hacks and free items. The primary lure URL is https://netcdn.tw/app/431946152/how-to-hack-in-teaming-bit-survivor-roblox-game-hack, which is likely part of a phishing or scam campaign designed to trick users into clicking through to potentially harmful content. No scripts were extracted, but the document structure and embedded links strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/how-to-hack-in-teaming-bit-survivor-roblox-game-hack In PDF document text
    • http://bgnails.nl/images/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-credit-card-payment-download-free_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-roblox-strucid-account_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/all-of-the-free-stuff-in-roblox_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-youtube_GM431946152.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_004_off000050c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C9 25116 bytes
SHA-256: e45baae9c143c1a52b0cccbb2ab4d6d1e38b41a0195b9faafc0baf84766d66f3
font_01_sfnt_off00008a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A44 19372 bytes
SHA-256: 1b9dae3d2fc092e35e590bee18b0d49c7f2667fe8a5491f243029636d656ddf1

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