Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1354bb662a5abbe…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 05:40:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f338d1134acc72b234a62d1fd8ae7b4d SHA-1: 78bf85be103fe3338b10a62666c1a97ba0b591be SHA-256: a1354bb662a5abbe63a35b08717d6d928331077ba3473149f179051a8e2c8e85
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks'. The primary malicious URL identified is https://netcdn.online/app/431946152/free-roblox-game-templates-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leveraging a social engineering lure to trick users into visiting the malicious site. The presence of numerous related PDF files on emindonesia.com further indicates a campaign distributing such lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/free-roblox-game-templates-game-hack In PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/tiktok-free-printables_GM835599320.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/roblox-generator_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-tiktok-accounts-with-2021-fans_GM835599320.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-cards_GM431946152.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_004_off00005301.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5301 27660 bytes
SHA-256: 34a80f73489500cb40b9569750ea67ad758992ff34fa709a6143615b03a41b0c
font_01_sfnt_off00009141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9141 18716 bytes
SHA-256: 1c580f2bed038c8cf3f1ee02051c5ed0fe41b255ca01efe72cb5be134ff2d1d8

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