Malicious PDF — malware analysis report

Static analysis result for SHA-256 0258c90912d50708…

MALICIOUS

PDF

51.2 KB Created: 2021-06-04 04:44:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e50c34e99d4f22fca1a34c0a45a514ec SHA-1: 608ab79e287f6f7237011488f80533641e8beb38 SHA-256: 0258c90912d507087db53cfa19385beb579ba188f08721fd4694fcbf42c8d235
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to exploit user interaction for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.online/app/431946152/free-roblox-gift-card-codes-2021-game-hack In PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/pubg-uc-buy-in-pakistan_GM1330123889.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://elibrary.stp-aviasi.ac.id/repository/free-robux-games_GM431946152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005251.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5251 31820 bytes
SHA-256: 2e4fa0c19f9d39f68e174e5699351d2da722dbec41a264438e639cdce933fd5a
font_01_sfnt_off0000996f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x996F 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off0000a36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA36B 18976 bytes
SHA-256: da888a05767b354bf4a788b28622fcb1db99041a598c845d67a69c5c37b8a5f7

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