Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852bebe17a6d9a3…

MALICIOUS

PDF

41.6 KB Created: 2021-05-19 10:26:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0acb1529d5c72e4de905bea705fd8476 SHA-1: 011d631a03c09cb81e42145bf3b33ed6d623bfeb SHA-256: c852bebe17a6d9a39d6506be461fd2a5d536f28f1c0252147c5588b1b96a9b1b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a game hack generator. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/1330123889/pubg-uc-hack-xda-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-u-get-free-robux_GM431946152.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/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-rape-hack_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_003_off00004534.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4534 25256 bytes
SHA-256: 43ef363b69d5a47a0d139a262c5bb56222d32567f6a53e0280d7c8e57eb19b00
font_01_sfnt_off00007ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF2 18700 bytes
SHA-256: 15f22126732e30ec553c6e87cd499c2c2b49c61dc2e3e635caaa8b3fb234e816

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