Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1d6aa390ab6b5e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 17:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aa5d542583e1cadda0565fafd5c90f48 SHA-1: d5db0195edf5c379a72826b17e3771a5ce430426 SHA-256: 1b1d6aa390ab6b5e4f2f590b4362304ab66a5de04629c513ba7af9fd29e7ce07
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/can-u-get-free-robux-game-hack PDF link annotation
    • https://library.sttbandung.ac.id/repository/how-to-hack-somebody-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-how-to-get-free-hats_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn 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/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/daniel-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/guuuddinfo-roblox-online-hack-for-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pubg-uc-60_GM1330123889.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-2021-unpatched_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/simple-roblox-hack-hp_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/tiktok-free-beer-for-a-year_GM835599320.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/getrobux-info_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-on-ipad-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002d59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D59 23340 bytes
SHA-256: ed5c1b665fafc9efd2b999dec0e63b0a7266bc96c3e2ccf0c71bf27b3267a320
font_01_sfnt_off00006239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 18820 bytes
SHA-256: 52be6a65770a01cbb173e94763e18c68b2166cf4419204c0ca48f3c63de48c00

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