Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1caa3ca4c6448e…

MALICIOUS

PDF

46.2 KB Created: 2021-06-04 00:36:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ee3d876d7cbebe8b89781b9acfe36fe3 SHA-1: 5c1b69bc78d813e7165b1e8ed594f97dedebb594 SHA-256: eb1caa3ca4c6448e6ade83deb6c1968756a7fb5dcb9520939117317ce569c30e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to a known malicious infrastructure hosting a 'Coin Master Hack'. The heuristic firings indicate that this is a malicious redirector lure, likely intended to trick users into visiting a site that may host further malware or phishing content. No scripts were extracted from this sample, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/coin-master-hack-2021-ios-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/gain-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/games-like-coin-master_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_off0000507f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507F 24416 bytes
SHA-256: a38c060ca46577ba5e68bce0641c24bc019ab772467ec863c220224107da72e6
font_01_sfnt_off00008840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8840 2896 bytes
SHA-256: 98478e2fbfabd582329b6206c0d46f67523cf5e299cb16118f1065b4dd5ec6a6
font_02_sfnt_off00009227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9227 18116 bytes
SHA-256: 77442674c0809aead75be931568f5718e5115af80d9dd84d81b0bed7d24a7281

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