Malicious PDF — malware analysis report

Static analysis result for SHA-256 742146c43633be5e…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 21:20:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a2446ee82b737fd46c9207c01c34e1e7 SHA-1: 10b625074d433f55e18c53eba887f6ad58a1319f SHA-256: 742146c43633be5ec268b1bc61dcaaf6cbac734e7ca494f0b42864b1524f4c49
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a call-to-action phrase, luring users towards a known malicious redirector. The primary lure is for 'free Robux' or game hacks, a common social engineering tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/codes-how-to-get-free-robux-game-hack In PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-jailbreak-cheat-engine-hacks_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/shotgun-willy-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/https-wwwrobloxcosims-4-cheats_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-imagine_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_off000031e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E2 22396 bytes
SHA-256: bb57b755bd00c96fd567eda8af5f1bfbdb152af6ae07565e7b00f00cdb947106
font_01_sfnt_off000063f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F8 19156 bytes
SHA-256: 1abe1f888ea44a86c9f7894949bd06bee09219bb3a2585bcc6d0e8e487c16c49

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