Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f5e499d77b4b54…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 20:56:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 571504e34763906d500034bac5e080c3 SHA-1: 3a1294d7763acb7765c04616a0c5bbd62f733ccd SHA-256: f1f5e499d77b4b54da1277e7b6d6d4f319ebe5139a7a42533a51c486a35e34e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/free-coin-master-spins-without-human-verification-game-hack. This redirector is likely used to deliver a second-stage payload or lead users to phishing pages. The document body and heuristics confirm the lure is related to game hacks and free currency, a common social engineering tactic. No scripts were extracted, but the PDF structure itself is used to host and deliver the malicious links.

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/free-coin-master-spins-without-human-verification-game-hack In PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-hack-lua-scripts_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-crashes-when-i-open-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/youtube-hack-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-working-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/pokemon-go-free-ditto_GM1094591345.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/sentinel-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/hacks-para-roblox-dragon-ball-rage-2021_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-into-anyones-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/username-and-password-roblox-generator-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-from-your-friends_GM431946152.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_off00003016.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3016 22504 bytes
SHA-256: a119b71e4606fe956c9f0c8862d40a77bd35ea0bb0918a1ec1d71a3717809021
font_01_sfnt_off00006228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6228 19072 bytes
SHA-256: bdaec13618f0e1747add95b1658441227a0f01124ba961934b3940087cc2858c

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