Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67157f0cfef69f3…

MALICIOUS

PDF

40.0 KB Created: 2021-05-20 13:03:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bbcdbf150f8f3b0a3f6928de6c0c655c SHA-1: edf1be7c60b147fcb2769983178b8defbf59f9cd SHA-256: b67157f0cfef69f3d938d11fbde9f1cd48f66f4b4b38b4208ddb1280ac7842b3
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics suggest a lure for 'game hacks' or 'generators', indicating a social engineering tactic to trick users into downloading potentially malicious content. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/how-to-get-minecraft-for-free-on-iphone-2021-game-hack In PDF document text
    • http://karolinaherrera.com/images/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://karolinaherrera.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://discord.ggIn 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_off000034e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34E7 26136 bytes
SHA-256: 8c08c41dfe26ad84f97a8715c15bb18aa5d3d67e5dc4a18a9d4346a80993b060
font_01_sfnt_off00007077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7077 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A28 18620 bytes
SHA-256: 9dfe6830e4eff682daeb487d834da197714a5bc305fe7f1b132f92f4a863de8b

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