Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c8c213281d857e…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 03:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da1bad73547ef9595a4677b0e88fc93c SHA-1: bf881936512daabc9b3f66e926acfb2d13c4e8ad SHA-256: 45c8c213281d857ea235cc8d51d4651ee8efda164bf5bf83503e2e76c27584b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free currency for popular games like Coin Master and Roblox. The ML classifier strongly indicated maliciousness, and the embedded URLs are associated with known redirector services. The document body and embedded links suggest a lure for users seeking cheats or in-game currency, which is a common social engineering tactic.

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-free-gift-cards-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-followers-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-password-easy-obby-june-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-speed-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-new-redeem-code_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-youtube_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-live-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-master-game_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_off00002e37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E37 22936 bytes
SHA-256: b9ed9d17f95d73c9af7e5ee4e492f3d5ef5db87b0840114fb07d742d376945db
font_01_sfnt_off000061ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 18172 bytes
SHA-256: f2f666f8efae858ca18be3d98771932124107df95f881e4d85f8b2df0a7d2408

Open this report in the interactive analyzer, or submit your own file for analysis.