Malicious PDF — malware analysis report

Static analysis result for SHA-256 3312c302864aeee7…

MALICIOUS

PDF

36.2 KB Created: 2021-07-03 22:47:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aba270f6a961266b9a9265ff759fd9d4 SHA-1: e4a968176392be1dc256b3086ed48e7768fea0c4 SHA-256: 3312c302864aeee7b27fb600893e0dd2ee57ec0864700f52bb8a0646d399a01c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to known malicious redirectors, specifically advertising game hacks and free generators for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-today-blogspot-game-hack, which is associated with malicious redirector infrastructure. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-daily-free-spins-link-today-blogspot-game-hack In PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/hacked-server-roblox_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-radio-on-roblox-mm2_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/pokemon-go-free-incubator_GM1094591345.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux-with-code_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux-fast-and-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off000033b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B6 23332 bytes
SHA-256: 17d5ddc97b5318698bae3dad375905a39632d4c7175d50c253a23f3c96e238b1
font_01_sfnt_off00006839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6839 19156 bytes
SHA-256: 09b1cdc1283068c485bfced7c85533ce23b9c20e7767d1eac4088bba3ec2de37

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