Malicious PDF — malware analysis report

Static analysis result for SHA-256 78abb663157946c6…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 04:41:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 16a5b5f92cf674bdf08525e1184d9b11 SHA-1: a2c74db941b4502f96810a051f0f7b5c2fc6f1b9 SHA-256: 78abb663157946c6cfcaae0af3ba686520dbd6322b6cfe58716d6626c51862f4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector for a "free generator / game hack" lure. The document body, though partially obfuscated, contains text related to 'Free Robux' and a URL pointing to malicious infrastructure. The presence of embedded URLs and the lure suggest an attempt to direct the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/free-robux-just-enter-username-game-hack In PDF document text
    • https://www.fhccu.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/coin-master-free-spins-link-blogspot_GM406889139.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
font_00_sfnt_off00004afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFB 25396 bytes
SHA-256: 68c049abaddedf6448f650e8109da96a93e2ff1ba3c959e1d1c7bc0c48b2322e
font_01_sfnt_off000085b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B2 18960 bytes
SHA-256: ad194f5984d8cbd7c817d1b512f86f024f40bf30beebdf7d12c6ff62fc849400

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