Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c3c0ce5d67bc45…

MALICIOUS

PDF

46.7 KB Created: 2021-05-12 18:36:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 420295685017dab38d8fd70cbbf24b2d SHA-1: 6b48ab6c78e627b5a29cf11e4723b0d8549b23a9 SHA-256: e1c3c0ce5d67bc45611c716a72d49ac996facff0a7c3b28447c439a2531fd9cc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to known malicious redirectors, which in turn host other malicious PDFs. The document body and extracted URLs suggest a lure for game-related cheats or currency, a common tactic for distributing malware. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 4

  • 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.
  • 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/406889139/free-spin-links-coin-master-2021-game-hack In PDF document text
    • http://centr-expert.su/images/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-apk-hack_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_003_off00004bc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC0 25896 bytes
SHA-256: dbf029224d9bce7677dcd1a92b7a411d9ff9265bc64c5233096be2ee41659608
font_01_sfnt_off000087a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A4 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off0000938d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x938D 18456 bytes
SHA-256: 2e3762c92aff24b7380dbd76867989e398d3e3dfa703baf994bdeb02abf23f5b

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