Malicious PDF — malware analysis report

Static analysis result for SHA-256 de16a08a57bcddba…

MALICIOUS

PDF

41.9 KB Created: 2021-05-10 23:43:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5f344aee0869b3f2309c2aafa3b66a15 SHA-1: 6d722f9e2f1f8ac76906ccba9f7904d247ab383c SHA-256: de16a08a57bcddba05379776025bea369de2e4d2ba0113c1f80424e7021c9a00
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to known malicious infrastructure, specifically advertising 'free coin master hacks'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. The document body, though partially corrupted, contains a URL that aligns with the lure. The primary attack pattern is a phishing lure disguised as a game hack, leading to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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-coin-master-hacks-no-verification-game-hack In PDF document text
    • http://archi-z.ru/images/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://archi-z.ru/images/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://archi-z.ru/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/info-roblox-com-robux_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D0 25668 bytes
SHA-256: ae209379a99c48b8fe76559d12f7e379dbc074a0a7beccbe692bd04ac530598c
font_01_sfnt_off00008250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8250 18016 bytes
SHA-256: 22df04c4dacbc852f4ecaf83adb1826ed6293343c5161e377e09b669fc2092ee

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