Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47b57e4f33a0193…

MALICIOUS

PDF

35.3 KB Created: 2021-05-20 12:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8b61fe7730c52a6e9fdf4e22f8f5d617 SHA-1: a289cd7182872332add2affd83271820e786733a SHA-256: c47b57e4f33a0193acbb6b77a707d993d5dbd01263a27ff23747b537bbdc565e
200 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically impersonating Facebook for credential phishing under the guise of free game hacks. The embedded links and document body text strongly suggest a phishing campaign aimed at stealing user credentials. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/how-to-get-free-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.xyz/app/431946152/how-to-get-free-roblox-game-hack In PDF document text
    • http://yochin.org.tw/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-link-blogspot-april-2021_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
font_00_sfnt_off00002fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD4 24860 bytes
SHA-256: a864ed6ddaa4fdd9f0d66fac6694a7b1a95d6cd21b794d089b1f31701165b418
font_01_sfnt_off000068ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AE 18216 bytes
SHA-256: 4bd910cbe6e13e3cc1fd56827474962a0b5b839547430a6bf478c6dff96655e9

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