Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b35f884d02a0004…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 14:05:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3e983f4c6b3faa3885a6522531f01d62 SHA-1: 7d6bdcd789c93623afa546dd1c58c99eff637797 SHA-256: 8b35f884d02a00047b0170ae2ff38501769e3268d36076453232a346fc330110
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game hacks and free currency generators. Several heuristics indicate that the PDF links to malicious redirectors and is part of an SEO link farm, aiming to drive traffic to potentially harmful sites. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-hack-android-game-hack, which is likely the initial stage of a phishing or malware distribution chain.

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/coin-master-hack-android-game-hack In PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/meep-city-free-plus-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-giveaway-website_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-robux-on-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-cheats-code-for-money_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/cwis-free-robux-gen-version-30-updated_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-all-need-is-user-name_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/hack-roblox-downla_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-codes-2021-on-iphone_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-hack-someone-on-roblox-with-old-password_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/hack-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-cheat-engine-alternative_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-use-cheat-engine-on-roblox-august-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/get-free-minecraft-account_GM479516143.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_off000030ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30AB 23220 bytes
SHA-256: 82621eeff54503b4339463be0a9f81aeb5652811d70f6c52aa85c47fc7ab9be9
font_01_sfnt_off00006523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6523 18180 bytes
SHA-256: f5cbea246cb26881ab0b077849d455766446565632394434fbc585ef7ce09a04

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