Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6257c6337bab46a…

MALICIOUS

PDF

50.2 KB Created: 2021-06-09 15:46:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 837611cc7cb474c7ee59c9824becf49a SHA-1: 7966d47453f7a2823fd5f3458ea753ec046b4144 SHA-256: b6257c6337bab46a3ca54fcc33f6e5c8d91b7c98bf364d1af739552e41dd95c9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as game hacks or generators. The document body, though partially corrupted, contains references to 'free generator' and 'game hack' lures, consistent with social engineering tactics. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-hack-a-roblox-server-2021-game-hack In PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-avetars-on-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-free-ply-no-download_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/hack-para-trollear-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/robux-hack-with-no-human-verifycation-or-surveys_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000552b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x552B 28304 bytes
SHA-256: 29abc05e60437f2ce0b4c603ff8913262c65c152ffdce5b296aebf3f83eeba5c
font_01_sfnt_off0000960c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960C 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAC 18860 bytes
SHA-256: b4486e1bd9d71d52c52b710b5492c0638d728269ec90f5f11f55d011de03720b

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