Malicious PDF — malware analysis report

Static analysis result for SHA-256 50601aab4feb84c1…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 08:55:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 85faddfe24cd0a9550be801839776952 SHA-1: ad14aea1af631a59dca4c9af3f3004bca432e2c7 SHA-256: 50601aab4feb84c19f15e04ded340405e181e53f42c9b8b4cea12105bf996bba
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics indicate a lure for free in-game items, coupled with a request for sensitive recovery information, suggesting a phishing or scam attempt. The embedded URL 'https://netcdn.online/app/406889139/how-to-get-free-coins-and-spins-on-coin-master-game-hack' is a primary indicator of the malicious redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/how-to-get-free-coins-and-spins-on-coin-master-game-hack In PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/pubg-uc-satn-al_GM1330123889.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/mcpe-116_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/games-like-coin-master_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_004_off00005271.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5271 30956 bytes
SHA-256: e6b464e52fc36bc92efc74052430b448f4095920e850d2075b1eb6217e35c67e
font_01_sfnt_off00009680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 18224 bytes
SHA-256: 1cc62c3a0a16cdc45a8bfa34d4f93d18d6e17ba0d5398a0785b1875f29a446c9

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