Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a90d6484fa4ab84…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 00:07:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1282dd5dbed18bd1f090d4e48107032a SHA-1: affce1fd8ffa3eef7490a59d85f4c35dc5e1ec88 SHA-256: 1a90d6484fa4ab8436feb71cf1eb79a7cf600f03b7161a29fc39eccee6367fc6
220 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and malicious redirectors. The document body and heuristic firings indicate a lure for 'free exploits' or 'hacks' for games like Roblox and Coin Master. The primary URL http://netcdn.tw/app/431946152/free-exploits-for-roblox-game-hack is identified as a malicious redirector. While no scripts were directly extracted, the nature of the links suggests a potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-exploits-for-roblox-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/how-to-speed-up-roblox-with-hacks_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-roblox-accounts-2021-new-method_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-jailbreak-get-free-money_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-compagnon-roblox-generator_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/best-free-admin-games-in-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-in-roblox-soul-stone-sim_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hack-proxo-smasher_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_off000030ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CE 23076 bytes
SHA-256: 5779d8be5bd1cb060f6284499e524721be860262f098b47099b1fe99eae7a368
font_01_sfnt_off000064b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 19048 bytes
SHA-256: 8972ce61ac0675ac16da68eab1f4f783fddbc9932eaa3946beb9ca390a13086b

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