Malicious PDF — malware analysis report

Static analysis result for SHA-256 e987c8716b00df63…

MALICIOUS

PDF

37.0 KB Created: 2021-07-04 01:33:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f6ac5eb47778eb8400ed13d1584971d6 SHA-1: 39940ea63df509d13776eb942b68aa6b2c076c1d SHA-256: e987c8716b00df6301c0c62ffcf4831fb09f8a96f746ba22b81b698f24704583
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, including a primary link to a known malicious redirector. The content suggests a lure for free game items or hacks, aiming to trick users into visiting these sites. The presence of numerous links and the redirector indicate a phishing or scam attempt, likely to deliver further malware or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/2021-free-spins-coin-master-link-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/cruise-ship-tycoon-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-wall-design-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-into-the-buildings-of-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/site-www-roblox-cheatus_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-use-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-anti-speed-hack-devforum_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-premium-account-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-play-now-for-free-unblocked_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-do-you-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-bee-swarm-simulator-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-tuxedo-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-games-on-roblox-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302C 22556 bytes
SHA-256: 7d4da21d94bada7030645e9c39e0113f0a6042474edd18877fc4a7f0aedc349b
font_01_sfnt_off0000627f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627F 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C64 18748 bytes
SHA-256: 06bd034753b49a7d0cfb2aac0b95d0bc387526a0c49ff8a26704903fcf1c9189

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