Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3ad22a20d50216…

MALICIOUS

PDF

35.4 KB Created: 2021-06-28 02:10:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c9e9762c68c1e029083b14b1fe2b484a SHA-1: a88bf3f89225b20eff2b0a6f17e9e170890ebbb1 SHA-256: 1d3ad22a20d502167d50d16c3308b2d4c53d5e2a3d2db7a3067bf56695a7c6e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting 'free generator / game hack' lures. The document body and embedded URLs reinforce this by advertising free Robux and game hacks, ultimately pointing to the malicious URL http://netcdn.co/app/431946152/free-robux-no-verificationor-offer-game-hack. This suggests a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-no-verificationor-offer-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/getting-free-robux-for-being-13_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-into-any-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-sad-cheat-story_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-swear-words_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-sword-gear_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-robux-facile-fr_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-rub-hack-generator-no-survey_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
font_00_sfnt_off00003106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3106 23232 bytes
SHA-256: 55246d35149954ba2fbf31ff89d4b58a58b718f979b19eaf3139604cb5eae164
font_01_sfnt_off0000657c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657C 19072 bytes
SHA-256: 06ad228c5397f7579b095543b790e73d9b27a09f6c27f16bb46ef61b621de0cf