Malicious PDF — malware analysis report

Static analysis result for SHA-256 3491e0f25ed192a9…

MALICIOUS

PDF

51.4 KB Created: 2021-05-10 16:23:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9bf52efc8dd6d541f1e4bf999f69604d SHA-1: 0fae32a0742c71de4e03fe3fe89eec7a04e08614 SHA-256: 3491e0f25ed192a90b1f4e8d74530822dc316d6f219da72e214e5a43eede8a20
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as game hacks or generators. The document contains a large number of links, many pointing to PDF files hosted on a subdomain, suggesting a link farm designed for SEO manipulation. The primary malicious redirector URL is https://netcdn.xyz/app/431946152/free-roblox-toys-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

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.
  • 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.xyz/app/431946152/free-roblox-toys-game-hack In PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://elearning.man2pamekasan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-instantly_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_003_off00004dbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DBE 28260 bytes
SHA-256: 1763545b86a1a6d7abf660ac0c09f9ff20fd434dbebe7e77ae9f4897326e07aa
font_01_sfnt_off00008ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF9 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off0000a769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA769 18128 bytes
SHA-256: ced59fa1f5966ac3cb16d2fbea4d1e317d998f5f31502ffb274740285f9cbd45

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