Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b20e5edc3943359…

MALICIOUS

PDF

34.2 KB Created: 2021-07-20 13:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c6286b915109e5d4b0f142519ffb2cab SHA-1: ad78912f2323d634f62058a85595c432edc8c0a4 SHA-256: 3b20e5edc3943359e5e1183f28a1e4f3ae577974b83a08f1ba6381b188e8d37b
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically a site offering 'free spins and coins' for Coin Master, which is a common lure for scams. The document body and embedded links suggest a phishing or scam attempt, likely to lead users to download further malware or compromise their accounts. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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.
  • 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/406889139/free-spins-and-coins-coin-master-game-hack In PDF document text
    • https://porownaj-laser.pl/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://porownaj-laser.pl/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://porownaj-laser.pl/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://porownaj-laser.pl/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://porownaj-laser.pl/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://porownaj-laser.pl/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://porownaj-laser.pl/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://porownaj-laser.pl/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://porownaj-laser.pl/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://porownaj-laser.pl/images/free-college-textbooks-tiktok_GM835599320.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
stream_002_off00002ee5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EE5 23520 bytes
SHA-256: 34ef16270ade36111f9124a65af280a1e77a4c6a37a273e1ead029aa3ef4643b
font_01_sfnt_off0000645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645A 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51