Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c078e550263d34c…

MALICIOUS

PDF

44.9 KB Created: 2021-06-04 05:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bf5398c4c2a7ce11056b58d93865a261 SHA-1: 6f0c8b5adf9bfb08c97eb7b100de7588c9b1cc42 SHA-256: 8c078e550263d34c67b93b070d9b381cc881e5c20ed5b7931a4c0af6b9798249
260 Risk Score

Malware Insights

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

This PDF document employs a lure of "game hacks" and "free generators" to trick users into clicking malicious links. It presents a fake CAPTCHA, a common social engineering tactic to coerce users into interacting with the malicious content. The document contains a large number of links to external PDFs, many of which are hosted on domains associated with redirector infrastructure, indicating a campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/how-to-fly-hack-in-tower-of-hell-roblox-game-hack In PDF document text
    • http://perpus.polimarim.online/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/pokemon-go-free-apk-download_GM1094591345.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/add-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn 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_off00005186.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5186 25332 bytes
SHA-256: dcfeae19ed256136c0adf65a53df4de65a888c3c61d7727f1e0ad8e325a62040
font_01_sfnt_off00008bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBA 18688 bytes
SHA-256: e08d091f61e6990d91005409efa873991294d7af1aa02f0aab1c025ffea8c9f9

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