Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a88849866e0c24…

MALICIOUS

PDF

32.7 KB Created: 2021-06-25 12:49:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f621421f009c88dd7b0c624a5978eae6 SHA-1: ff52ae65415c8b250fcb78bb09531ef6def6c58d SHA-256: 22a88849866e0c24d4acb12a2677f540336bff6909be39a514e5937056a87c50
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are hosted on academic domains but appear to be part of a link farm designed to attract users searching for game hacks and cheats. The primary malicious link, http://netcdn.co/app/431946152/btools-roblox-hack-game-hack, is flagged as a known malicious redirector. The document body also contains a call-to-action phrase, 'CLICK HERE TO ACCESS ROBUX GENERATOR', further reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/btools-roblox-hack-game-hack In PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/a-discord-server-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/any-gamepass-free-roblox-script_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-redd_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-hack-xbox-one_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-exploit-2021-no-virus_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-shuts-down-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/lollipop-simulator-hack-sckitp-roblox_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_off00002afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AFC 21996 bytes
SHA-256: 245e8f2c1d9659cf3966aeae09b153d225081a205841e43ef0a1d5586829f253
font_01_sfnt_off00005baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAF 18760 bytes
SHA-256: 8ba06c0f035fb3d2dc2d2bbd5e19efba49f6e46b69db33d29c40b644276bc4ed

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