Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26df4bbc11aaa12…

MALICIOUS

PDF

37.6 KB Created: 2021-05-21 09:18:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bd1e406f43fb382df2774ac2db3fed2b SHA-1: 406cb69005df1a78dd263b4616ecf59726498fb0 SHA-256: b26df4bbc11aaa12c46bb1221b34ae956c55b0962693a7a83f4b1493a89e2398
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to sites offering 'free generators' or 'game hacks', a common lure for malicious downloads. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically identifies this pattern. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to trick the user into downloading a second-stage payload, likely related to the lures presented.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-accounts-with-robux-that-work-not-banned-2021-game-hack In PDF document text
    • https://inscastellar.cat/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://inscastellar.cat/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://inscastellar.cat/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://inscastellar.cat/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://inscastellar.cat/images/how-to-tiktok-hands-free_GM835599320.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000329e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329E 26496 bytes
SHA-256: 790e495f65f95365fdfe3272521226b4fddb99b15b56434a4deba34affd6792a
font_01_sfnt_off00006d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8E 19652 bytes
SHA-256: 72c791ad1c4340ed85ac0ecdba514e35635851f3f818d4a167a4eafc97bf1d2a

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