Malicious PDF — malware analysis report

Static analysis result for SHA-256 a019de7deb63fec5…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 17:51:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9fd8b25ee96b42381c69fdeebe1b0350 SHA-1: 30fc6359833034ee23eb3d8cbb6df955c91a9930 SHA-256: a019de7deb63fec5c2a5756e33f52c35e1181c6e2a656c691ae815d7b2c7c090
260 Risk Score

Malware Insights

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

This PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and brand impersonation for credential phishing. The document body, though heavily obfuscated, contains references to 'free Robux' and 'game hack' lures, aligning with the observed malicious URLs. The primary attack pattern involves tricking users into clicking a link that leads to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • 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.
  • 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.online/app/431946152/free-robux-on-iphone-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
  • 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-robux-on-iphone-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/ok-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/tiktok-free-online-books_GM835599320.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_off0000507b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507B 27836 bytes
SHA-256: 2129727e95e4e1d425904002d98b967e006272723463f1669b048a0066929d4a
font_01_sfnt_off00008ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBE 18356 bytes
SHA-256: 09002ce3ba94cfa5154e24d4605185e25e9b5ae3e76d565aeacf431b5bbbf1e5

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