Malicious PDF — malware analysis report

Static analysis result for SHA-256 964b724c51fc57cc…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 06:27:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1e0ce81ba6c1536e4af3ab657cc6c1ea SHA-1: ee105a0e279991759336db8b20ab69f63c2ab3ec SHA-256: 964b724c51fc57cc131b0cec3a41137495708f17e4c7dfcc24c5ac708669ee13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a redirector link disguised as a game hack generator, which is also present in the document body. This link leads to malicious infrastructure, indicating an attempt to trick users into downloading a malicious payload. The ML classifier also flagged this PDF as malicious.

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/how-to-hack-coin-master-apple-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/pokemon-go-free-7km-eggs-august-2021_GM1094591345.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-verification_GM431946152.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_off00005367.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5367 24348 bytes
SHA-256: 72752ef1a7f936c244d6bcecb3eeeedd973c248b5039c9ad4f3bd0b9533d3ef9
font_01_sfnt_off00008b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000950f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x950F 18128 bytes
SHA-256: b6a735d9e3f53415aa491e3485cc1cfcf2c3f420c3f64ca45b3fcf2c99820254

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