Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c7bdf124faab31…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 18:33:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 322789dc95d83997de674d7cc18a4b22 SHA-1: 01f097c8ee6d994861b507466fcf140247a246ff SHA-256: a1c7bdf124faab3103f1cf2dd6ee0fda42910e35d48a944c34f95a32c81835c7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of providing game hacks and cheats. The document body and heuristics indicate a lure for free in-game currency or hacks, directing users to a link farm of SEO-optimized PDF documents. The primary malicious URL identified is http://netcdn.co/app/431946152/blue-roblox-hack-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/blue-roblox-hack-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/robux-cheats-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/be-hacks-to-use-for-no-clipping-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-hack-pc_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-roblox-shirts-to-take_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/download-hack-roblox-2021-fr-bee-swarm-simulator_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-give-away-live_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-denisdaily-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-roblox-wild-savannah-inf-health-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/mapa-de-free-fire-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/websites-that-give-u-free-robux_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
font_00_sfnt_off0000310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310A 22528 bytes
SHA-256: df6b6b1c475d14688eb21230b7624bdb9e864db87484951ae91dfac21e269231
font_01_sfnt_off0000635c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 18796 bytes
SHA-256: 7d6b673be22dd9c8d1fa1412effdd9b404e4f15194efb9180c887a7a98dc0067

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