Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec461b5152f05b0e…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 00:20:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a09fe8ca3f94698e9b120a49972b8651 SHA-1: 1f425f859b2a2a5d361efcbd1c7973bb878526a5 SHA-256: ec461b5152f05b0e653e5cc6b3c2d27de58d571fbeae14cdfebf48feb5b7617d
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a malformed exploit stream and links to known malicious redirectors and extensive link farms, all disguised as game hack generators. The document body and extracted URLs indicate a lure for users seeking free in-game currency or cheats for games like Roblox and Coin Master. The presence of exploit-related heuristics suggests the document attempts to leverage vulnerabilities for client execution, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/roblox-mobile-hack-game-hack In PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/free-robux-generator-com-bing_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/cheats-roblox-mine-simulator-julio-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/cheats-for-meep-city-roblox_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/hack-jailbreak-roblox-2021-pay_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/roblox-hack-admin-script_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_off00003102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3102 22760 bytes
SHA-256: 1c42bc7d16b547c551f6d0df3d2a8061ca58ed539c3a28331ff62645b32f5069
font_01_sfnt_off00006441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 18972 bytes
SHA-256: 0e9155019685f09988e5274749080987783afe0cd242ca2fcc27e9f8310fa0e4

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