Malicious PDF — malware analysis report

Static analysis result for SHA-256 83148230e81fc472…

MALICIOUS

PDF

33.0 KB Created: 2021-07-08 05:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a428f27da067dd3fe3fa4ab8be8cdd01 SHA-1: 0d7af9f4c76ad2d4425ae11b0f621dc157a9697c SHA-256: 83148230e81fc472e767c68b72e7b964c383459b5494af211123490db3d20dc8
220 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/479516143/minecraft-java-free-game-hack, which is presented as a lure for game hacks. The document also hosts a large number of links to other PDFs, likely part of an SEO link farm. The presence of these links and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful content or download sites.

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/479516143/minecraft-java-free-game-hack In PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-get-free-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/robux-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/hack-de-robux-2021-julio_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-builders-club-free-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBB 21444 bytes
SHA-256: 660d2eca3b38320f40c42d509d4c36b11fb32c7fd35405be87dd294e664fceba
font_01_sfnt_off00005eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 18136 bytes
SHA-256: 6eb1f737dc26468ab321cead5519c6da0f94fa913db2fdf5dfa3628eb349cd49

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