Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d6bf21c8eb27c7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 13:50:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b16088683f66df3f5f044309fdc67a4f SHA-1: d8df2469ab526db1329fc3a5c69764c634205add SHA-256: 24d6bf21c8eb27c70211443d8c6570f1f419347130610ec664ea132b1b6be59d
220 Risk Score

Malware Insights

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

The PDF document contains numerous links, including a critical redirector link to 'http://netcdn.tw/app/431946152/free-robux-hacks-no-verification-game-hack'. The document body and heuristics indicate a lure for free game currency or hacks, suggesting a phishing or scam campaign. The presence of many external PDF links also points to a link farm strategy to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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.tw/app/431946152/free-robux-hacks-no-verification-game-hack In PDF document text
    • http://library.forda-mof.org/katalog/repository/programa-para-ser-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-hack-exploit-no-virus_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/all-free-skins-on-roblox-for-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-items-for-free_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-no-buying-things_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-land-free-robux_GM431946152.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
font_00_sfnt_off00002fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB 22564 bytes
SHA-256: 31dbed5ce5442899ffd344117b04d2198c45be9237f1cc93f30b05fd78b0b2db
font_01_sfnt_off00006220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 19244 bytes
SHA-256: d7f6b7ff3c0ca36ad551dc1698c04b5b051d82f77f85620dffbaec3331a8b166

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