Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ae655d27b0144e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 07:59:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 998c018ad10060a797e9ab79c4329509 SHA-1: bdc5d373f6f97d78a0a1b7c28a7f8620fc7be189 SHA-256: c1ae655d27b0144e32355e70f66c614c9a3d2b12877150b316b5da921c8651a3
240 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that promise free game currency and hacks, indicating a phishing or scam attempt. The presence of a malformed exploit stream and ML classification strongly suggest malicious intent. The document body and heuristics point to a lure for 'free Robux' and 'game hacks', likely leading to malicious redirectors or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/free-robux-accounts-2021-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-way-to-make-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-for-free-2021-no-vertification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-free-robux-100-virus_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/final-stand-hack-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-for-coin-master-that-work_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_off00003113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3113 22124 bytes
SHA-256: 71405d55ba2975a2d024eae6d598e20ef7206e12e7f3ae19e86328f37158bbad
font_01_sfnt_off000061da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DA 19224 bytes
SHA-256: 156e97e656f4bb783494abd7ae53ecfa8912a458841a7d4a142d29130362a46d

Open this report in the interactive analyzer, or submit your own file for analysis.