Malicious PDF — malware analysis report

Static analysis result for SHA-256 5347a149434d0208…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 10:50:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 74ae526098d1a9ff89818bff936683b5 SHA-1: 4a93d0af5d8d570a334b9de9ec30dd1b0c2d589a SHA-256: 5347a149434d020829fdc1954c9fa9519c2e6436399224ea14436422a39bc518
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are disguised as repository links for game hacks and free currency generators. The primary URL, http://netcdn.tw/app/406889139/pasos-para-hackear-coins-master-game-hack, is a clear lure for game-related cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a tactic to drive traffic to potentially malicious or ad-filled sites. No scripts were extracted, but the document's structure and content strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/pasos-para-hackear-coins-master-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-bloxburg-free-to-play_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-use-aimbot-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-faces-roblox-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/1-billion-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-date-and-time-hack_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_off0000308c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308C 22396 bytes
SHA-256: 07ce15b4242bc88c744457c1b757f9ffeae3c00b08bf0fd0c1e0f374e1495212
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 18160 bytes
SHA-256: 8de320d26ad23d14df74f7a15048384cdc3d2e03834f709f531179936ba98ebc

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