Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e32fdb854308bd…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 08:22:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a077afc89e8be6f35de8e9741f6f3cf2 SHA-1: 85e7ecb52fc098b34987c09ee36efc60f9af1854 SHA-256: a9e32fdb854308bde6993b91abc19aed9e8d6ec7aa593a18e3eaae6a8846a763
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting game hacks and generators. The document body and embedded links suggest a lure for users seeking in-game advantages, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/431946152/wahoogaming-co-free-robux-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pokemon-go-free-636_GM1094591345.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-bonus_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_off000050d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D8 24744 bytes
SHA-256: 160854e1df10befeecb221a534de4247453758d8a8e5818c09b91e634c8ba865
font_01_sfnt_off000089c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C6 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000093b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B0 19272 bytes
SHA-256: 78de909b7ffb92602eadaeed37aeb712efe7a44911c114e8956161378fc8ed7d

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