Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46a3e28ed84e9df…

MALICIOUS

PDF

43.8 KB Created: 2021-05-11 05:25:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5a826775136338030ca060829ef4ff13 SHA-1: 4eede14d7084c2102f12f413511163bcd870864f SHA-256: a46a3e28ed84e9dffb3cb26eda224bad2c9ad1eeedcd49c67f17e51061849d5c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "game hacks" or "free generators." The primary lure is a "how to hack any Roblox account" theme, directing users to the malicious URL https://netcdn.xyz/app/431946152/how-to-hack-any-roblox-account-game-hack. The presence of multiple PDF_MALICIOUS_REDIRECTOR_LINK heuristics indicates a high likelihood of this document being part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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.xyz/app/431946152/how-to-hack-any-roblox-account-game-hack In PDF document text
    • https://jas8.com.tw/image/data/files/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/easy-robux-com_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/roblox-rewards-robux_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_003_off000047fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FB 27988 bytes
SHA-256: 8262ea2e9c543fd0dd7053eb2f3b2f9066fdf692f0caaa2df2b07f5c6400a8af
font_01_sfnt_off0000873e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873E 18772 bytes
SHA-256: d5ac01ba848f85c7af00746e0b4ab9643e0d1d2f53353368de6e0e250a854553

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