Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f2c5f1a1f85045…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 16:01:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ef98cb2243664499f5c95eb20793b85d SHA-1: 52844ff74874a4901bf5e72cb4eb3f3e00d6e510 SHA-256: c7f2c5f1a1f85045558d98bc71436e7f76ae4d06393017b7b4cde908fdab280c
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, all promoting game hacks and free currency lures. The document body and extracted URLs suggest a phishing or scam attempt to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-free-spins-ios-app-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-have-game-pass-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-hack-into-roblox-groups_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/hack-week-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-tycoon_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-murder-mystery-2-cheat-engine_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-download-unblocked-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-account-hacked-what-to-do_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-2021-roblox-codes_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/5-roblox-games-that-give-free-robux-working-youtubeyoutube_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-coins-coin-master_GM406889139.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
stream_002_off000030f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F0 22048 bytes
SHA-256: a3deb9047d77580b034fe83346b9c527571f1df816494bc1af03221044cd3a20
font_01_sfnt_off000061b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 18176 bytes
SHA-256: dc04036921b1963ee7132b828a33de2130f87ab3daccf07c14a967ac057e6417

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