Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d82c09fdde8237…

MALICIOUS

PDF

38.5 KB Created: 2021-05-20 18:20:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0537d8ce204131bc527cb509b6a1caab SHA-1: fcfa3170f45ea17773b19b454fa34115a61255f5 SHA-256: f1d82c09fdde823767e7119561bb89e21c205320c0aa7f3e92b5d44721cb637a
200 Risk Score

Malware Insights

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

The PDF document contains links to known malicious redirectors and lures users with promises of free game hacks and followers. It also displays a fake CAPTCHA, likely to trick users into executing further malicious actions or downloading additional payloads. The embedded URLs suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/835599320/free-tiktok-followers-instantly-game-hack In PDF document text
    • http://thehancgroup.com/images/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://thehancgroup.com/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://thehancgroup.com/images/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://thehancgroup.com/images/tiktok-free-tools_GM835599320.pdfIn PDF document text
    • http://thehancgroup.com/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003401.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3401 24084 bytes
SHA-256: fb213c868b3d215b7fda72c8e7aa2e3699046ebad30bd5645d317786b3a4e602
font_01_sfnt_off00006ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 3124 bytes
SHA-256: d6dd29adb69da7f9a23a5e3791282a61e2f811794f560a0c409c8747766d9102
font_02_sfnt_off00007591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7591 18100 bytes
SHA-256: f27faf11ab9b731ff59c8a2736de67f71ae1dcd874c0843e76df7710bacb1c6d

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