Malicious PDF — malware analysis report

Static analysis result for SHA-256 76caa2f8f6348fcf…

MALICIOUS

PDF

45.7 KB Created: 2021-05-10 15:16:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 663d611376f5af40ad87c2f9b8903dc8 SHA-1: 3debe91b7afff4a99a39f66cec2d8c07d8e87091 SHA-256: 76caa2f8f6348fcfe7b20ceceeff0d674b75f3bb5f0b716c9edc35df36ea2d54
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. These links likely serve as a distribution point for further malicious content or scams. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/coin-master-free-spin-links-december-30-2021-game-hack In PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/toolbox-apk_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/minecraft-pvp-hacks_GM479516143.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_003_off00004c35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C35 24480 bytes
SHA-256: 72781c4765a66989712b08e59d7090fa96baf9732dc10f9cf5c69a631d9780d6
font_01_sfnt_off00008375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8375 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5F 19216 bytes
SHA-256: 1dbe36d510364522962f6a70e6f7eef96e8f8e931686e1b7e724a642dc91dfe1

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