Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c7a8c5e16a1657…

MALICIOUS

PDF

47.1 KB Created: 2021-06-07 03:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f90867d05c02f2f371f9223ee7efbe57 SHA-1: e293e0dace32b88087a05bb14d66f052f3610819 SHA-256: 11c7a8c5e16a165726724614aabc963be5e70f72ba159e9f4039a27167681ad8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' or 'game hacks' to entice users to click on embedded links. These links, such as the primary redirector at https://netcdn.tw/app/431946152/claim-free-robux-2021-game-hack, are known to lead to malicious infrastructure. The document also contains a large number of links to other PDFs hosted on perpus.unpam.ac.id, suggesting a link farm or SEO poisoning tactic to distribute the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/claim-free-robux-2021-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pokemon-go-free-evolution-trade_GM1094591345.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pokemon-go-free-643_GM1094591345.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spins-coin-master-app_GM406889139.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_004_off000052cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CB 28072 bytes
SHA-256: 06126b392e492e3ed1d9d1ba446f247086eaebb04ee3ab30837dd668591fe42e
font_01_sfnt_off0000937d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937D 19100 bytes
SHA-256: 71bfe675eda37229698c052fc2860111c6db3b0806d8c9466b91e8b3552f6925

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