Malicious PDF — malware analysis report

Static analysis result for SHA-256 df24128ae9eed6e5…

MALICIOUS

PDF

42.0 KB Created: 2021-05-13 02:47:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 692deb9e2d36b9831f7b407547c00444 SHA-1: 0935ed3d985aa65a58dae56772e1444de66a2090 SHA-256: df24128ae9eed6e59daa20f871b1a82c7c610721f53d0b8247d3e103aa884504
240 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a known malicious redirector, disguised as game hacks and free currency generators. The malformed stream length and ML classifier indicate exploitation attempts. The document body and embedded links suggest a lure for users to click through to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.xyz/app/431946152/websites-for-robux-game-hack In PDF document text
    • http://serviio.org/images/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/roblox-2021_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://serviio.org/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://serviio.org/images/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/earn-rbx_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-game-pack-coin-master_GM406889139.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_003_off000049e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E6 24052 bytes
SHA-256: ead018d3291a1257bffbbb4dd227d58a964fd1dc08b6842c67c8dd398fe7e6db
font_01_sfnt_off0000810f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810F 18436 bytes
SHA-256: a0892a7c6a4df3f32c2c8d55016a82ae07dc296688f989f87a4165413345201d

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