Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f68c6db35159fb1…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 01:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0f39749349ab7efcfda5097be96a4204 SHA-1: 49a8fec9cf0600ff534d28d1ca661f57a8ab2531 SHA-256: 9f68c6db35159fb1b51762c5a61aedb8601575b39d0b21deb8dfc41ed2bb9e94
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' and 'game hacks' to entice users. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to malware download or credential harvesting. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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.tw/app/431946152/bux-free-robux-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-redwood-prison-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hunting-rifle-script-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/claim-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/download-roblox-paintball-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/descargar-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cheat-for-dinosour-simulator-on-roblox_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
stream_004_off00005371.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5371 27404 bytes
SHA-256: 02b7927f1d1be9b4e5bf6e9ab73bdcd6ee3127a00731669358a47cc41bd30d6a
font_01_sfnt_off00009311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9311 18012 bytes
SHA-256: 48dadac1a540eb24f39d188e0eb07df2fd2c4cea4184d8a92cbd726ce4786484

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