Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b668fe7e0b09d24…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 05:52:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ca69b71aa8715a927bda4238c0672db8 SHA-1: f8f677dea2a48ce9417f77406168a118e073dc7a SHA-256: 1b668fe7e0b09d24131187190928ad5532324f06650ba80f3c33064d8a45f7eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and free currency generators. The primary lure URL is http://netcdn.tw/app/406889139/how-to-get-free-coins-in-coin-master-game-hack, which is flagged as malicious. The document body also contains embedded URLs and a call-to-action phrase, reinforcing the deceptive nature of the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-coins-in-coin-master-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-hack-app_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/i-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/113-hacked-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/cheat-qui-dupli-sur-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-tiktok-likes-quick_GM835599320.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
font_00_sfnt_off0000355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x355A 23200 bytes
SHA-256: 700226308fb0e9c70e7b5156147815b45c47578a49766c127df563584cd37c4c
font_01_sfnt_off00006996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6996 18164 bytes
SHA-256: 9fab875a536b983537b9433768b1ea3e5c55ad95c87001a66781b974c182b662

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