Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac81d7bec6fe9525…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 02:25:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 842e99ea6de7efbd750843b52ab3a8c9 SHA-1: 629bad229971c8fbd356dda94d1fd5f91cdab8ca SHA-256: ac81d7bec6fe9525fc25461b0792e8c39d0575235f7c8195a4b705d80596b99b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as game hacks and generators. The document body and extracted URLs strongly suggest a lure for users seeking in-game currency or cheats, leading them to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/coin-master-hack-ios-no-jailbreak-game-hack In PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-on-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-tuto-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-site-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-hack-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-games-to-hack-on-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/cheat-codes-for-pokemon-galaxy-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-free-robux-no-fike_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-roblox-pins_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/robux-hack-for-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/hack-roblox-dragon-ball-rage-android_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-play-free-without-downloading_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-boombox-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/play-coin-master-online-free_GM406889139.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_002_off00002f58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F58 22332 bytes
SHA-256: b65869e4f6e3cf9f249b8226540bad54a17a7364bb118c1b4cae8eded56535ce
font_01_sfnt_off000060f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD9 18404 bytes
SHA-256: 345b4b10f5918f406b1f79bf6dc118df3430b7a97c564e099ef402e5b5a3dc62

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