Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0627561053d0b1…

MALICIOUS

PDF

41.6 KB Created: 2021-05-01 09:36:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3739bd375244adce01cd344e1c2da432 SHA-1: 763d39c2b0f7bb82381f882088855841b70c2b7f SHA-256: cf0627561053d0b18c932308974f7210d96cf9471958c875407a228a0957dca0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'free generators' and 'game hacks' for Roblox. The document body, though partially corrupted, contains a prominent URL that aligns with the heuristic findings. The presence of these malicious links suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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/free-roblox-account-generator-with-pin-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/dungeon-quest-hack-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-bloxburg-free-on-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/jailbreak-hack-free-robux.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/free-private-server-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-exploit-trial.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/best-free-exploit-roblox-bing.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/unjailbreak-roblox-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-faces-on-roblox-october-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-generotor.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/robuxlive-stream-robux-hack.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_off000043ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43EF 25900 bytes
SHA-256: 26be79abbce29b8d73fed1a825c8429ece53df1764dd6b92bcbb9d2bf8a8add5
font_01_sfnt_off00007e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E96 19060 bytes
SHA-256: 7200aba3c73ac4b0b170e2e3b8ec3d5033def010d03247ff48ab06dabefc6fed