Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f71e56bd5335a…

MALICIOUS

PDF

40.9 KB Created: 2021-05-23 14:14:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7d789402d22b2fba7177c0ec9fd55d1e SHA-1: bbfd85fe07dd19b5d401374574388cf5521a5dbf SHA-256: fc4f71e56bd5335a3b6ae6d65a41e5effa494ae5bbe8f74ee716729b8088f463
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains multiple links to known malicious redirectors and hosts files related to game hacks, indicating a lure for potentially unwanted software or further malicious downloads. The presence of a "remote support tool lure" heuristic suggests the document may also attempt to trick users into granting remote access under the guise of assistance. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7508

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/479516143/minecraft-mobile-free-game-hack In PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000341b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341B 28896 bytes
SHA-256: 44814ea3401fcfec7573768ae784441cb2741fa5d391230eeece4d64c5c93f5a
font_01_sfnt_off00007588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F72 17944 bytes
SHA-256: ce10a2b2c496b69fcf76f31cd4916c063e1dd9befde4055646c3ea28f41e8e8e