Malicious PDF — malware analysis report

Static analysis result for SHA-256 948408f800d199a0…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 13:51:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8edd7b7232394ee06f1ad985d95651ab SHA-1: ab231790ed1f149212996f40958dc365db94dee7 SHA-256: 948408f800d199a09223affec38d090dadbc16456ffaac8b0ffb9917b820dc27
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm designed to redirect users to potentially malicious sites, specifically mentioning 'free generator / game hack' lures. The document body, though heavily obfuscated, contains URLs that align with this theme. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/431946152/oprewards-com-earn-game-hack PDF link annotation
    • https://lib.btkljogja.or.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/block-best-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://krnl.rocksIn 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_off00005224.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5224 27208 bytes
SHA-256: 61bd436c9e31892a1ce4e6e1bd2a859a6d40a72308bbf5dc468d17b1065d9a1c
font_01_sfnt_off000092e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E5 18344 bytes
SHA-256: 4ebadb41269d4d53a149b3f737cb33750c79454e6afcf27c4e79d6db23fa6b8f

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