Malicious PDF — malware analysis report

Static analysis result for SHA-256 524fb7b13b8bde87…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 10:56:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5322817a528ba27cf23ec5f28fc200e9 SHA-1: 0b5e580e9b9167c61384d42e1e488c20309f5b44 SHA-256: 524fb7b13b8bde872ad4123072ba8cc64e8843a1df6e41e0f33e1c9a26466648
260 Risk Score

Malware Insights

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

This PDF document contains numerous links designed to lure users into clicking on potentially malicious content, such as game hacks and free currency generators. The primary link, https://netcdn.tw/app/431946152/how-to-hack-other-people-roblox-accoubt-game-hack, is associated with credential phishing and redirector infrastructure. The document body and embedded links suggest an attempt to exploit user interest in popular games and services for malicious purposes.

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.
  • 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/how-to-hack-other-people-roblox-accoubt-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/how-to-hack-other-people-roblox-accoubt-game-hack In PDF document text
    • http://szekelymozes.ro/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/is-free-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://szekelymozes.ro/images/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/pubg-uc-rate-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/download-roblox-for-free-pc_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/robux-game_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_off00005027.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5027 24972 bytes
SHA-256: 5dc59aa0e172fe911cc1b1afab5e2bbc9a406612a7caeedd7d4e6f2b7144878e
font_01_sfnt_off000089fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 19088 bytes
SHA-256: 78b1ab76ba6705d6e1c310fd5e3c4de14d57431a6177d872aefdcdfa5839a157