Malicious PDF — malware analysis report

Static analysis result for SHA-256 afed9cde4caa07b1…

MALICIOUS

PDF

42.1 KB Created: 2021-06-13 23:31:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ec3d6f8a5c80c1347d2cf609a7d3121c SHA-1: 0c7e5038f463061d96c2f9fcb886f781038a5724 SHA-256: afed9cde4caa07b1ac5c4b99d3c731234c2a71c5931669919b9973b82d03edd6
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for "Free Robux 2021" and game hacks, directing users to a known malicious redirector. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting malicious sites. The malformed stream length and ML classifier also indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://netcdn.co/app/431946152/free-robux-2021-insoect-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/free-strucid-privet-servers-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pokemon-go-basic-vs-premium_GM1094591345.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-retrieve-a-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-affect-the-server-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-april-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/como-coneguir-robux-gratis-roblox-pc-sin-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/como-hackear-a-tu-amigo-en-roblox_GM431946152.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
font_00_sfnt_off000047fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47FE 24772 bytes
SHA-256: cc8d51d5b3ed655191e2c290ada4d455f35d51706413f8078f5eca891cde3ec5
font_01_sfnt_off0000813a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813A 18520 bytes
SHA-256: 7ae460249e0d133ab37af31778ff4459da2be5f754d2ea4b009ab49ff566236c

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