Malicious PDF — malware analysis report

Static analysis result for SHA-256 988f4ca308ca4ba8…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 03:11:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37104599751d41d4b67be6a99ab811e2 SHA-1: 8bdded50291d69437cb7229fe351acd6b7c85522 SHA-256: 988f4ca308ca4ba8aeea9266d29562fa9c4ebae25703fd570c58def6ed0480fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free in-game currency or hacks, directing users to a malicious URL. The heuristic PDF_GAME_HACK_REDIRECT_LURE specifically identifies this pattern. The document body and embedded URLs reinforce the social engineering aspect of the attack, aiming to trick users into visiting the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/you-promised-my-son-free-robux-game-hack In PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/script-pour-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coun-master_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-pokemon-go-accounts-level-35_GM1094591345.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/how-to-change-my-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/hack-matar-gente-roblox_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/how-do-you-hack-other-players-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-hack-prision-life-2021_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/how-to-get-free-robux-for-free_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_off00002dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DBF 22356 bytes
SHA-256: a8eac9dae02dfafc3c83187ee349b64852f057021555d71df57444b14b95604b
font_01_sfnt_off00005f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F72 19960 bytes
SHA-256: f29a7a7b71d38b505cc7d4cb2f72b745270787244330deb29ff722716c8b7989

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