Malicious PDF — malware analysis report

Static analysis result for SHA-256 983bc001365b3c6a…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 09:59:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 85a502d413a2b0e040b809e7ec33c852 SHA-1: 5db31aeffa04966b268c236fddb5afd29f0e4d2f SHA-256: 983bc001365b3c6a0cd26d7e3c1df732cf6205444fb9a30e00acebd36271bc1d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body and heuristics indicate a lure for game-related cheats, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious URLs and the lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-spin-links-coin-master-october-30-2021-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/where-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-devil_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fd5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD5 26492 bytes
SHA-256: 91ff022aa4d38d0f36d1dec8868b880b9e16286371d127f1344e47e8d472a499
font_01_sfnt_off00008c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C88 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9673 18788 bytes
SHA-256: 87b86729e947f81c5a05c0b15119ec86872d8ed29c351927f1fec7084a910a19

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