Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e58ddce50f239a…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 10:45:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a53507bf07a056bbdc39f36e47065b0e SHA-1: d4d269c8c2022ee5d63620b114498ef10d6be965 SHA-256: 79e58ddce50f239ae8bdcf38f1dc8f5dbdf10bc7020f0157817197d75b8a777c
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" or "generators". The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-homepage-game-hack. The document also includes heuristics indicating a lure for password-protected archives, suggesting a multi-stage attack where the initial PDF serves to trick the user into downloading and decrypting a malicious payload. No scripts were extracted, but the overall pattern suggests exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/coin-master-homepage-game-hack In PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/wurst-mc_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005477.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5477 25020 bytes
SHA-256: af0082f6bc9073626120c7f67cf63c3f15ad00f7e0f46ba07f34eae3cdabfbd8
font_01_sfnt_off00008d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D03 3204 bytes
SHA-256: b7fe42cb1da39e96c756399b3532633df029c1fbb3443b9e17d98df25c90dc65
font_02_sfnt_off00009806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9806 18272 bytes
SHA-256: 52ebbe1a6e32e78051c45f89c5d9c36e23c607fff486e02539fc8f460cac04ef

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