Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffacc6c444ba82a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 16:50:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: efd11ce96f70a88ee54b34383cc30f6f SHA-1: 4935f4eb1afdf067bb91ba4739731cb64d47a9e5 SHA-256: 4ffacc6c444ba82a179f406ab1c108b9d5ac2b58fd1f2242ad2fc595326f34d2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be game-related hacks or generators. The primary link redirects to malicious infrastructure known for hosting such lures. The document body and embedded links suggest a phishing or scam attempt to drive traffic to potentially harmful sites.

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.tw/app/406889139/how-to-get-free-spins-and-coins-on-coin-master-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/tiktok-free-10-likes_GM835599320.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-robux-apk-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-admin-commands-on-roblox-no-injector_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-build-a-boat-for-treasure-hacks_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-do-you-fly-hack-in-roblox-murderer_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/meme-attack-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-for-robux-on-pc_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_002_off0000301b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x301B 22872 bytes
SHA-256: e3d0e3c480ab0f243b9d1263c2cd7bd1fc33bf0ea1a4474eaf393502cd356110
font_01_sfnt_off0000635c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 18512 bytes
SHA-256: b5acc537c59d1b7fb5e9a8b7451230baa0910c2ee96a0f773c75b2c56351fbac

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