Malicious PDF — malware analysis report

Static analysis result for SHA-256 c212775fba38464f…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 09:43:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0543d8387ef8df46cb962495b0e76f7c SHA-1: 4b684e2928ba205a86c8f5a00b6cbf07ddd66f28 SHA-256: c212775fba38464f6f1ce5c19988944a976c53d70829f717df47a215f86f4dc4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free spins to trick users into clicking a link. The primary link directs to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-today-gift-reward-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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/coin-master-free-spins-and-coins-today-gift-reward-game-hack In PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/rewardex-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/pokemon-go-free-download-hack_GM1094591345.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/pokemon-go-free-roam_GM1094591345.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/apk-coin-master-hack_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_off00002e2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E2B 22236 bytes
SHA-256: cb050bcda30f4df3f7e76d2fb9105159d2db08ac119c043a44250f56b3db6f1c
font_01_sfnt_off00005fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA7 18692 bytes
SHA-256: d31088ae19f241ea86c3227f133fc8e6698cecaa627da06b5b2cde690df300ac

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