Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b2847723a73580…

MALICIOUS

PDF

42.2 KB Created: 2021-05-19 17:38:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ce6f1836d7502b0b1fe5d5ccbc063ed5 SHA-1: 780c05ac60cd2fd6d8d645a88e6db7dfcb865bce SHA-256: 82b2847723a73580b6f78cde548ffe2d4c84b3cd979021c6ea788c012d6c6a0a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and generators. The document body, though heavily obfuscated, contains references to these lures and the authoring application suggests it was generated programmatically. The presence of a 'download button' lure and an MFA harvesting lure further supports a phishing or credential theft objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/1330123889/pubg-uc-murah-game-hack In PDF document text
    • https://www.yantan.com.tw/upload/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/block-best-robux_GM431946152.pdfIn PDF document text
    • https://www.midasbuy.comIn 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_003_off000048f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F3 24756 bytes
SHA-256: cbe9d1d4b3dccfcc2848c0415e9204bf1b5f5e7124e455bb9825da35e586ec75
font_01_sfnt_off00008214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8214 18488 bytes
SHA-256: 48068724849f00872e9f93b91db19732a052bd2de215f2e00373c34f4c3f94df

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