Malicious PDF — malware analysis report

Static analysis result for SHA-256 2725de268661fdc4…

MALICIOUS

PDF

35.7 KB Created: 2021-06-29 02:30:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 429ea946e0b1fef02b363f7fb1501cf3 SHA-1: 05d2978c3c815907a910df03a4d5355dff6f850d SHA-256: 2725de268661fdc44077e9f9f2d41e391ceeebe96ef0a6215ef28fc07d6d5317
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and a link farm, suggesting a phishing or scam attempt. The document body and extracted URLs indicate a lure for "free Robux" or game hacks, designed to trick users into clicking malicious links. The malformed stream length heuristic also suggests an attempt to hide malicious content.

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.co/app/431946152/free-robux-no-vertification-no-survey-no-pasword-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cheats-fro-csgo-in-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/if-roblox-wasn-t-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-free-mewtwo-hack_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-dragonball-online-adventures-cheats_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-generator-2021-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-20-body-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-items-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-a-roblox-account-easy_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_off0000325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x325D 22376 bytes
SHA-256: 15167ab010aa3d78a102e428ba9689e9e590c0b1775f45d2ab1f4c07909ced0b
font_01_sfnt_off00006443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6443 19860 bytes
SHA-256: d5d46a1bd74c815a151c9ad91bf3d51f86c6c3790046b38fc065d5d6e6398ec1

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