Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ca62d8f3087325…

MALICIOUS

PDF

52.7 KB Created: 2021-05-11 04:09:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 78a4157395fb5835006becc5fc1a539e SHA-1: 13ebacf9bb18bc219598f1c0a9de6f5d7e42d86e SHA-256: 69ca62d8f30873255bd35f2eb6959e25b4ef6ed025e52df0c2d1575f38e7c488
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.8788

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/minecraft-bedrock-download-game-hack.
  • 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/minecraft-bedrock-download-game-hack PDF link annotation
    • http://schmittmusik.de/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://schmittmusik.de/images/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://schmittmusik.de/images/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/collect-robux_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004955.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4955 25176 bytes
SHA-256: eeb9c2ff261101ff4e3a410cef9e0218b8d1058f8dfb97cb48d2d2b67c1d0448
font_01_sfnt_off0000827d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827D 8064 bytes
SHA-256: aa3f052f51467678095423abb8ee600593029b83723c59ecbb97ea01ee673d7a
font_02_sfnt_off00009c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C11 4232 bytes
SHA-256: ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5
font_03_sfnt_off0000aa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9D 18676 bytes
SHA-256: 71d03cd911f296367a63c790b96900f67ec797f491b3f6a6ddf408856ea79078

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