Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a7a39c08bf6cdc…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 00:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e983174abe631c969369583707083d57 SHA-1: 1b8ef5f3539226f635f75f7e85299c8c85ba2fd5 SHA-256: 55a7a39c08bf6cdc3b0abd3c2f089fbb55bd6e72141b4dedaf4921be1c2cce19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and free spins, directing users to a malicious redirector URL. The ML classifier strongly indicated maliciousness, and the presence of numerous links to similar scam-related PDFs reinforces the phishing and social engineering nature of this document. No scripts were extracted, but the document's primary function appears to be redirecting users to potentially harmful content.

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/get-free-spins-coin-master-2021-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-builders-club-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/ilum-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-no-logo_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/mobile-for-free-24-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-dungeons-free_GM479516143.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_off0000314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314B 23340 bytes
SHA-256: 13467c7225f1baf453e6155c655a51ee0583b00127a72d9f6d261c47dd294726
font_01_sfnt_off000065f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 18576 bytes
SHA-256: 47068641d4cd5afad495b2744cbb78709b2a1d88425159384b1e35df59296f67

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