Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b7d78eec222243…

MALICIOUS

PDF

49.8 KB Created: 2021-05-17 20:06:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 61b47dd0d42f0bd10963d51532534546 SHA-1: 59e893d8a5e321e18d82206f158876c26217d813 SHA-256: 70b7d78eec222243f635f52aa273cd8f7f4dd5e563079b4e84d88737b5fe60c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a 'free generator / game hack' lure. The document body and embedded URLs strongly suggest a social engineering attempt to trick users into visiting potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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/431946152/free-robux-no-human-verification-or-survey-or-download-2021-game-hack In PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://nyomansuwirta.com/assets/CKImages/files/static-moonactive_GM406889139.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_off000049c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C4 29936 bytes
SHA-256: 4e55c3444f0e5b6e085111044f62b3acee6218ea54f5d882aae3181d11542227
font_01_sfnt_off00008d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D98 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAA 20136 bytes
SHA-256: 66e5e50e12f5eb49621ab9bcd6ab85026409d616512a452c1eb3339dd9867554

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