Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05cd2087e27b0e9…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 08:44:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee76db6ebbd058fbf3afbb0be13d4f56 SHA-1: ef1a122261b9a1437186aba096e76c2953565b6d SHA-256: d05cd2087e27b0e9abb6979ff02bf0da7b9a326b2d5204eec0a53f45d9a76de2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/free-robux-today-game-hack, which is presented as a 'free generator / game hack'. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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.tw/app/431946152/free-robux-today-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-obtener-robux-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-774-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-do-you-get-bloxburg-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-someones-robloc-account-for-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-new-catalog-items-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-roblox-im-poison-life_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-roblox-prison-life-v2-02_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/rbx-sites_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-shield-link_GM406889139.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_002_off00002ec4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EC4 23392 bytes
SHA-256: 7fc5b0b9b6a3fab6399a343d0e09d82c902e274942a93d15b9e6246db803e797
font_01_sfnt_off000063ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 19072 bytes
SHA-256: 46cfca18e06d620ca18af6b576997b97068e9f2425fa6aacc62e6f72c392fa15

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