Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a153cd6191de914…

MALICIOUS

PDF

47.7 KB Created: 2021-06-11 13:15:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 700dd123a72973e9481ae3283652384f SHA-1: 77d1d3bb02a5e9894dc28a9c3518106fb2125fda SHA-256: 0a153cd6191de91433738d6fda81f2ef4d95dbb9070895c19abc0a9650d3d405
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The document body and heuristics indicate a redirection to malicious infrastructure, likely to download further payloads or lead users to scam pages. No scripts were extracted, but the embedded URLs and PDF link farm heuristics strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/hack-para-dragon-ball-rage-2021-roblox-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://kierowcyhgv.uk/images/how-to-use-roblox-loki-hacks_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kierowcyhgv.uk/images/free-roblox-accounts-for-gampass-for-ultimate-driving-simulator_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFA 24704 bytes
SHA-256: 443cca06e8b02054470407769c0ba1bb49a5b6297580a8ca87f797fad35ede0b
font_01_sfnt_off00008793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8793 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000094a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A5 19196 bytes
SHA-256: e3d016df842b934646faa07edb2627a45897b334d587850d47fa865d3b20dbc2

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