Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d180b54193a5f3…

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 04:40:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dcd03f970fee5914679c6d9eea128478 SHA-1: a79a553b977195b045bb3ca2df9d83df1508fb04 SHA-256: 14d180b54193a5f33e80be229cf1c3426ef4fdbbb8038bf4e9c40356da714c8e
240 Risk Score

Malware Insights

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

This PDF file exhibits multiple critical heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links designed for SEO manipulation. The document body and extracted URLs promote 'free Robux generators' and 'game hacks', a common lure for phishing or malware distribution. The malformed stream length suggests an attempt to obfuscate malicious content, likely JavaScript, which is often used in PDF exploits to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.co/app/431946152/free-robux-generator-no-survey-or-verification-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/codes-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-noob-vs-pro-vs-hacker-vs-god_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-2021-instantly_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hackear-cuenta-de-roblox-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/pokemon-go-free-and-home_GM1094591345.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-tener-mas-seguidores-en-roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-roblox-builders-club-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacking-my-roomates-roblox-account_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-infinite-health-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-noclip-in-roblox-cheat-engine-67-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-collect-free-liverpool-scarf_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-hackear-cuentas-de-roblox-android_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-united-nations-siterobloxcomgames_GM431946152.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_off0000307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307F 22504 bytes
SHA-256: f79c4ff15d92470ac864b8867abd2934fe46d8afc403a8e200d653ce176e50fb
font_01_sfnt_off000062c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 19368 bytes
SHA-256: 95b9d1297c530edf0fd86de2554d79382814e67c1a6ce1e60e57a1d6ac2d2458

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