Malicious PDF — malware analysis report

Static analysis result for SHA-256 102d30dc69cf9b80…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 14:15:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 817b7e24718aeb96cff396aca1c5e8fa SHA-1: eb3912d236c64fc99925e0332391151c14571315 SHA-256: 102d30dc69cf9b8021c96428b40850218edc59556c2e536f2f09cda0a40b9e76
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, specifically advertising 'free generator / game hack' content. The ML classifier also flagged this PDF with high confidence. The document body and embedded URLs reinforce the lure of obtaining free in-game currency or hacks, which is a common social engineering tactic to trick users into visiting malicious sites.

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-roblox-toy-codes-2021-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/jefftec-robux-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-hacks-in-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/cheater-sur-roblox-nul_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-on-a-computer-safely_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/did-my-roblox-get-hacked_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/stick-master-luke-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-robux-hack-generator-android_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-dominus_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_off00003182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3182 22368 bytes
SHA-256: 6c7dcb3807b4e2c86ccbc7c95c29389cd10963ebb63ce2408e621d630178f0bb
font_01_sfnt_off00006358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6358 19404 bytes
SHA-256: d69dc009ca5c1a88d041a827f1c58a74829db1b517c4b80ace25ccdd541b8d6b

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