Malicious PDF — malware analysis report

Static analysis result for SHA-256 59674ee0a11bd7b2…

MALICIOUS

PDF

44.6 KB Created: 2021-05-12 05:07:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d6ddae56a40002df8f964c00df69ca3c SHA-1: 2f08cd2d30974ac9ee183e8699bf566b7ef348c7 SHA-256: 59674ee0a11bd7b20e118e87ca898eceef821eef49082f71ea1734884614fc1e
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/479516143/get-minecraft-for-free-game-hack PDF link annotation
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/robux-claimer_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.youtIn 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_off000049ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AB 25184 bytes
SHA-256: 2ea51224182993fb692014d3b17408634402f7e8098ff9787619d9aa44e62a33
font_01_sfnt_off00008300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 3092 bytes
SHA-256: 3811f2fb1880daf4953efcc9c7427d9b438bced237490b00be4a6ec3ecea79e0
font_02_sfnt_off00008dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAB 17712 bytes
SHA-256: 35f99bfb73b52248bbdf58e6e807942ea3200a6c0759a8418b864f3a1fae0a50

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