Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5af67013b75add…

MALICIOUS

PDF

49.3 KB Created: 2021-06-09 03:46:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a91b0d286bbf43a8f97eeb5399a399e4 SHA-1: 988add809cda5ce691f82322b83934020c03037b SHA-256: 4d5af67013b75adddc4927358c9a7e3a24cb57e18de94046a8dee15c64918540
200 Risk Score

Malware Insights

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

The PDF contains multiple links that impersonate the PayPal brand but direct users to unrelated domains, indicating a credential phishing attempt. The document body and heuristics suggest a lure for game hacks or generators, which is a common tactic to trick users into providing sensitive information or downloading further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-dump-roblox-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.tw/app/431946152/free-dump-roblox-game-hack In PDF document text
    • https://audev.com/images/hack-des-robuxs_GM431946152.pdfIn PDF document text
    • https://audev.com/images/free-roblox-cards-no-verification_GM431946152.pdfIn PDF document text
    • https://audev.com/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://audev.com/images/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://audev.com/images/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://audev.com/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.audev.com/images/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://audev.com/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://audev.com/images/roblox-level-100-hack_GM431946152.pdfIn PDF document text
    • https://audev.com/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/roblox-meep-city-game-free-download_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://audev.com/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://audev.com/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://audev.com/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://audev.com/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://audev.com/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F23 28052 bytes
SHA-256: be282fe60146b399648a15979e3b790a58c24d1ab1f6603526822254d8969f09
font_01_sfnt_off00009030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9030 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD8 18692 bytes
SHA-256: e5bdd3005624d987a92394210d3212672f673b3daec2b4f3f6ceaa08eb857ae3

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