Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44653d710754722…

MALICIOUS

PDF

35.0 KB Created: 2021-07-07 19:10:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: be9cf300d72a1e6a108786d5a665c5ed SHA-1: 72c7d151357bc3fa7a8711b9106563f57e328216 SHA-256: f44653d7107547227301ee8aea90818090fe5f4e34e477f8bfe4710301199bce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering game hacks and free currency, indicating a lure for users to click through. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to drive traffic to potentially malicious sites or phishing pages. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

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-34-6-hack-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-on-android_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-paintball-level-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-play-roblox-hotel_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-not-fake-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-jailbreak-how-to-get-money-free-and-fast_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-aesthetic-outfits_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-welcome-to-bloxburg-money-cheat-july-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox_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_off00003170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3170 23108 bytes
SHA-256: 849b4c7090dc786c78b5355eb6a48db368526822605eebee605f57e27d1db7fc
font_01_sfnt_off0000656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 18408 bytes
SHA-256: 771a2c558fbd10cbfd7734f1954a2b8d2b1d40b927f150a26b434975924ea7dc

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