Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b770a40d499d86…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 10:56:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53fbd53e1c39f1d042571766a867d646 SHA-1: 9b39381777a78276d67777c726e0b5959244e0c8 SHA-256: 01b770a40d499d8670d1f5b761fcb54c80995f4df865236cff3f0ba743f46bf1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and free currency to entice users to click on links. The primary link redirects to malicious infrastructure, and the document contains a large number of SEO-optimized links to other PDFs, likely part of a link farm designed to improve search engine rankings for malicious content. The ML classifier strongly indicated maliciousness, and the overall structure suggests a phishing or scam campaign.

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/431946152/mathep-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-luac-scripts-for-lvl-hack-shinobi-life_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-25-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hack-coin-master-net_GM406889139.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
font_00_sfnt_off00002ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF8 22192 bytes
SHA-256: bfebf5febe2b19ae5b541bbf49428869eec0799d32ee6f898e84b4cb281f4a04
font_01_sfnt_off0000614e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614E 18544 bytes
SHA-256: 49092de834d3f8fc0161edca5c8ffc9035116622ffbf8cd5420aeadd749a8349

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