Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3f730471a391c9…

MALICIOUS

PDF

33.2 KB Created: 2021-07-06 06:54:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b2edbb8ad1a1890b4e3f137818225f80 SHA-1: 179d4077ec6053741b14f0f7ce38bfd68b54107b SHA-256: 2f3f730471a391c9de1b706c21a5729303a224e0584011fdc9992ac8ef3f4dec
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them, promising free in-game currency or hacks. One critical heuristic identified a link to a known malicious redirector, and another indicates a mass external PDF link farm. The document body explicitly contains the URL 'http://netcdn.tw/app/431946152/free-robux-not-a-scam-game-hack', which is presented as a 'free generator / game hack'. No scripts were extracted from this sample, but the extensive link farm and redirector suggest a phishing or scamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-not-a-scam-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-hack-2021-october_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/game-pass-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-ad-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/smurf-backpack-gives-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-items-on-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-promo-codes-august-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-gift-cards-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-2021-android-apk_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
font_00_sfnt_off00002c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9E 21828 bytes
SHA-256: 76b85124d42c7bbc1099849cd1ec82afc932fc2fb672fbeab94b2c1aae79818e
font_01_sfnt_off00005c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C85 19080 bytes
SHA-256: 14e01471e6a07db1a68c511ee00ed8ed146bd69de2dd1952b6465b95f794ce32

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