Malicious PDF — malware analysis report

Static analysis result for SHA-256 aace10b3f57d5830…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 16:04:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2e4d9b0b0898945950a487e181f4bcb8 SHA-1: 5511ce5f0671213feb81916c1404654f3fa6073b SHA-256: aace10b3f57d5830e4bf7fc07422a0a0b47cbefac192aaecd7ea214b9d5a92c5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs designed to attract users searching for game cheats or free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a download button lure and callback phishing lure further supports a malicious intent to trick users into visiting these sites, likely leading to malware downloads or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-game-hack
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/real-coin-master-free-spins_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-hack-no-verify_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-hack-programmers_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-ios_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-latest-mod-apk-free-download_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/websites-for-robux_GM431946152.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/minecraft-ps3-free-download_GM479516143.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-coins-coin-master-daily_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/get-free-robux-com_GM431946152.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/hack-coin-master-343-apk_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-hacks-for-cards_GM406889139.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/robux-win_GM431946152.pdf
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-roblox-girl-hair-not-a-model_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d9f.bin
47fedde0e3b1a86c5e0e61790a44589004d7abb7622ada7c5ce2003456cbd2b1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9F 24460 bytes
font_01_sfnt_off000085b1.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B1 2880 bytes
font_02_sfnt_off00008f9c.bin
0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9C 17712 bytes

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