Malicious PDF — malware analysis report

Static analysis result for SHA-256 67180f3d54c701c4…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 16:22:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 467ca3287c77a31e3dd608f57d278989 SHA-1: ef7d322d78247212e4a8f6078dd51905ba07a9d5 SHA-256: 67180f3d54c701c42754952a15bc23b58e5e1811aa0ba905444bc71650fb166d
220 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors and a link farm, masquerading as free game currency generators. The primary malicious URL is http://netcdn.tw/app/406889139/daily-coin-master-free-spin-link-game-hack, which is associated with a known malicious redirector infrastructure. The document's content and structure strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/daily-coin-master-free-spin-link-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/what-to-do-when-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-by-using-cookies-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-offers-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-link-app_GM406889139.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
stream_002_off00002fdd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FDD 22572 bytes
SHA-256: 119c8e5fbaefdbdca6d01182c4f67af752dd9087aa175ab8c85eff17a328a6f5
font_01_sfnt_off00006202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6202 18768 bytes
SHA-256: 6995f58a3344afdf1c39eea442142c3f86a5b05fd2aa483286546d573d63d37d

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