Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff402fd05bc8e40…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 10:41:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 551c0e7ac424290281998548610eea2a SHA-1: b61693d71d994c94078120e06df49de6a26f96a3 SHA-256: dff402fd05bc8e40b393f46ac6654f93c7e676c65014fda5fc0d6652e5b06a12
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and a link farm, indicating a lure for users to visit potentially malicious websites. The document body and heuristics suggest a scam related to game hacks and free in-game currency. The presence of embedded URLs and the ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-daily-gift-free-spins-and-coins-link-today-game-hack In PDF document text
    • http://thamelinn.com/userfiles/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-no-human-verification-and-no-survey_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
stream_003_off00004a69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A69 25384 bytes
SHA-256: 1d63de0bcea21a75e89fd93acadde6e7154396c1ca23951745478d611ae81bfa
font_01_sfnt_off00008350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8350 18652 bytes
SHA-256: acc88e8ff3d4d09cb66d664b97f6065b804d1ea0ab1b79688b3054775362f50f

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