Malicious PDF — malware analysis report

Static analysis result for SHA-256 627f0464713f6281…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 23:25:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e83b064be39021b9a7e4f26f62537698 SHA-1: 9fc0377c3b4f19908ce476a6546e58c2732c1b06 SHA-256: 627f0464713f6281d679cdcef159f24437fc63e016dc6312837891ed8e1ba1d9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game hacks and generators, directing users to a known malicious redirector URL. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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-accounts-with-builders-club-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/pubg-mobile-uc-2021_GM1330123889.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-2021-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-clolthes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cheats-for-roblox-on-phone_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/click-here-now-for-free-robuxs_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-hack-version-free-download_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-ser-hacker-en-roblox-jailbreak-2021-mayo_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cheat-tables_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-lego-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-game-cheats_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/rbxoffers-com-free-robux_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_002_off00003062.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3062 22800 bytes
SHA-256: c0fbae400735d8c7c860cc3dcf6e5debf6c67956384dc48396c3d111dee52c8b
font_01_sfnt_off000063ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CA 19552 bytes
SHA-256: b1eb7f5cc000dbd6647d8142d7b5a18728747fb2d8c014d369b8d8e037db6dcf

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