Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c47a10345270bc2…

MALICIOUS

PDF

36.9 KB Created: 2021-07-08 10:07:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1d9fade0a4d2d6be0472d22175dd5553 SHA-1: 37d0fd098eafe6e5adf6386461d2975be65c897e SHA-256: 8c47a10345270bc21581eae37302ec2b2df570a70d4114d7bf278a7b430a247b
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/406889139/how-do-you-hack-for-2021000-coins-on-flip-master-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-unlimited-money-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-do-i-get-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/what-is-the-best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-cute-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/pokemon-go-free-64-bit_GM1094591345.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-ultimate-driving-roblox-check-cashed_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-robux-on-android_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-download-or-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-search-for-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/has-my-computer-been-hacked-playing-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.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
font_00_sfnt_off000035d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35D5 23224 bytes
SHA-256: c1b395cfc3597b9199239515b84dacc7435708409eb8ccd2a55278958dddd891
font_01_sfnt_off00006a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 19452 bytes
SHA-256: c8ad09a7683cedfe9f879a1626265398ee02a7c0ef10268f80ee74ae1434d92d

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