Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd002fb4f56769…

MALICIOUS

PDF

47.3 KB Created: 2021-06-09 04:06:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e9a587ff7ee92927c65b176d7b68a265 SHA-1: 373a5abf24ec74efc5d7659050215f25051f6470 SHA-256: b3bd002fb4f56769c6f59068c89a594b80543f3b57f27f31cfab03372d2f09db
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a lure for game-related cheats or currency, directing users to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Free Robux Apps' and a URL matching the heuristic findings. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-robux-apps-that-actually-work-quick-download-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pokemon-go-basic-vs-premium-rewards_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-changer_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pubg-uc-global_GM1330123889.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_off0000520e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520E 27988 bytes
SHA-256: db0ab2f9e92fbd19d7e646fa8c056024428d028639c5eaa9612841dca49e6cc5
font_01_sfnt_off000090e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E9 20096 bytes
SHA-256: aa1ca165877eb8e65785060d1aad57054702ce8d8513e55143505cfe0d8591dd

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