Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d8bb55e3342def…

MALICIOUS

PDF

47.3 KB Created: 2021-06-09 11:32:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a208373bf18e92f82fb2f0c31d5592bf SHA-1: 4fd7edf6cb4aba7f33f6b5be886504563683a294 SHA-256: a5d8bb55e3342defb837fa75176e4d6e68f003cb9ba214789623aca3c4b35bd6
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and is designed to trick users with a fake CAPTCHA or human verification prompt, likely to facilitate the download of a second-stage payload. The embedded URLs and the nature of the lure suggest a phishing or social engineering attack aimed at users interested in game hacks. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-jailbreak-outwitt-hacks-game-hack In PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/best-level-7-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/earn-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005422.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5422 28140 bytes
SHA-256: 51650ee80c1f8e685eb6209cd52674efb86acbcbc12414fc006e5f693cfa791b
font_01_sfnt_off000094b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B5 18876 bytes
SHA-256: b4c2efd6c2ab30406b82b19700c2925d7c5414194070ef124b8cb441448fafa1

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