Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd5133914d5ced1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-10 19:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5ea5111fef645b6e340ead43314be16a SHA-1: c4a25659c932cc3969f0b9607f481c4cf212c3f7 SHA-256: fdd5133914d5ced13e18d352412a3048528929296cec620d641074c68ceebe57
260 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirectors and SEO link farms, masquerading as game hacks or free generators. It also presents a fake CAPTCHA to trick users into interacting with the malicious content. The primary URL used for the lure is https://netcdn.tw/app/431946152/how-do-you-get-free-chat-on-roblox-game-hack. While no scripts were explicitly extracted, the nature of the lures suggests potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/how-do-you-get-free-chat-on-roblox-game-hack In PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-cheat-mad-city-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/no-hacks-working-on-roblox_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/www-resourcly-ml-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-link-download-hack_GM406889139.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/roblox-free-account-giveaway-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-facebook_GM406889139.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_004_off0000530c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530C 26420 bytes
SHA-256: 8de02fd30337dd056b971b02c7d42e8aa8580e8a4b94e318a99b651ea83c9218
font_01_sfnt_off00009140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9140 19080 bytes
SHA-256: e0e795d4552e423f11065317108335deb2371b2daa25657fdf4d92dd76f8c1ce

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