Malicious PDF — malware analysis report

Static analysis result for SHA-256 556ab44b47943ddf…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 07:26:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a0d927069a9c3e40ca4b48599ad1a1c SHA-1: 084fe692536cb223f872f842a315f7cd3c3015f3 SHA-256: 556ab44b47943ddfaebc90529a2a1a5d4929991a81e898555807881d3fb437d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector URL that advertises 'free generators' and 'game hacks', a common lure for phishing and malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest the document is intended to lead the user to a malicious website, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/robux-for-free-not-fake-bt-scammer-kid2021-game-hack In PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-hack-how-to-get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-no-human-verification-superfast-inspect-no-password-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-free-followers-on-tiktok-without-human-verification_GM835599320.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/is-roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-roblox-gift-card-redeem-codes_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-python-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-username-hack_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/hex-code-hacks-not-working-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-5-million-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-hack-sans-verification-humaine_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F7 25140 bytes
SHA-256: 128ab1268cc831e108906919416a41bb2aa9d844d7c0da1d1fc8c1196a20bec7
font_01_sfnt_off00008d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D83 19472 bytes
SHA-256: 8aec0db105fbb6dbf4f3aa84e570e4bd6fa399f97c0ecf4f4ef4702feefc7d7d

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