Malicious PDF — malware analysis report

Static analysis result for SHA-256 92987f5fe3543d6f…

MALICIOUS

PDF

42.7 KB Created: 2021-04-29 12:08:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b16350dee0b200898a85a38d55d63dd8 SHA-1: 8ac7aa540f02c068640227af71e48f6f1d522500 SHA-256: 92987f5fe3543d6f21143c97aa670ad4dbe71ee01eb6923dcb4359477fa871d0
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirectors that are flagged as malicious, specifically promoting game hacks and free item generators. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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-natural-disaster-survival-hack-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-level-up-hack-on-roblox-phantom-forces.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/jamaica-roblox-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-on-amazon-fire-tablet.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-f12-cheat.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-invitations-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/one-punch-man-roblox-hack.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-no-robot-verification.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-2021-promo-codes-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-hack-out-of-bank-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robuxs-pa.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004156.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4156 23916 bytes
SHA-256: 59d0ffd870f223e070ed31fa4278aceb65dce45f19a96449300bc6aca3f0e1a2
font_01_sfnt_off000077b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77B6 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off00008305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 18828 bytes
SHA-256: e904368c43d4c18bfd9689f0215f74e6643abe677af739c963e93a3780e83586

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