Malicious PDF — malware analysis report

Static analysis result for SHA-256 1643854770a30cd1…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 15:53:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9d3df93a4d86ca306f816a475b05b66a SHA-1: 1d088b9176a6964ccebc1715b33bb767ac7742fc SHA-256: 1643854770a30cd12082071217939927455d16af166f5ace786e9bf48d37ec0c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on domains associated with SEO link farms and malicious redirectors. The primary lure appears to be related to game hacks and free currency for games like Coin Master and Roblox. The presence of multiple PDF links and a critical heuristic firing for malicious redirectors indicates a high likelihood of this document being used to drive traffic to potentially harmful 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/406889139/coin-master-game-hack-kaise-kare-game-hack In PDF document text
    • https://ourlady-elearning.com/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-dinosaur-simulator-cheat-codes_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/como-hackear-roblox-para-tener-robux-en-android_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-script-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/im-being-called-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/www-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/itv-television-centre-roblox-free_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-cheat-engine-btools_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/20-free-spins-coin-master_GM406889139.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_off000031d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D4 23340 bytes
SHA-256: 7c1d401b8cb466b946b46488865d3b7d300ffa4d98302a39b58b4f3c2dce1ca5
font_01_sfnt_off00006652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 18264 bytes
SHA-256: a8389fbf181df9705b3255eb4c4696b43f8c72abea2faab980217b88f505b556

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