Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fb5a88671410f8…

MALICIOUS

PDF

42.2 KB Created: 2021-04-30 06:23:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 457379e093f7b0a76b864a7dc3f9decf SHA-1: 75c09f732573d5784e7d610769b0a4a97103153e SHA-256: 24fb5a88671410f8c806ce92283cb566d5ab749cadb3c7144a67f2e87cb4c9e6
160 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering 'free Robux' and game hacks, which are common lures for malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text and URLs consistent with this lure. The presence of embedded URLs and the nature of the lures strongly suggest an attempt to direct users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • 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.
  • 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/roblox-hack-robux-2021-unlimited-robux-and-tix-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-promocodes-hack.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/lazybux-com-free-robux.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-model-purchase-request-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/redeem-code-roblox-free-robux-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-just-enter-username-and-password.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hacks-roblox-phantom-forces.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/getbucks-free-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-free-hack-download.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/fps-roblox-hacks.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/bleus-free-robux.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off00004371.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4371 26832 bytes
SHA-256: 41b8cccf82d157c538e9caf4543bd8b13d638affb4ef4c281644714901c2698a
font_01_sfnt_off00007f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7B 19568 bytes
SHA-256: ac518762b5a890746361bf7a2e6ed89d9f0808ee8ae3c651ae432622afad6751