Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb5c8d5540ea3cb…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 09:06:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6c5e7b54b63aef1506c8276a048044a6 SHA-1: 08623b504de226f78de550c23e84042feea6ca2c SHA-256: 7bb5c8d5540ea3cbe6a19a9417c57cd669444861f126b0ce3ad717bb85c6dc6b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'Coin Master Hack Tool' and containing numerous links to external resources, many of which are also PDFs. The primary redirector URL, http://netcdn.tw/app/406889139/coin-master-hack-tool-for-pc-game-hack, is flagged as malicious. The document body and heuristics indicate a pattern of SEO-based link farming intended to drive traffic to potentially malicious sites, likely for further exploitation or phishing.

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/406889139/coin-master-hack-tool-for-pc-game-hack In PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hack-into-roblox-account-may-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/cheats-on-skyscraper-tyocoon-2-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-stuff-in-roblox-on-phone_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-change-name-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-a-free-dominus-hat-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-roblox-no-password_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-free-robux-game-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/is-pubg-uc-hack-possible_GM1330123889.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-android_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_off000030d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D3 23260 bytes
SHA-256: ac9e620ae252d38a3ea3854621d12d80d4f1559594024b46a2659a70528468ac
font_01_sfnt_off0000656a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656A 18396 bytes
SHA-256: 80da1b26748c0421ddbffdda9c90c0e7a8145a19b82875246f398f650b172979

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