Malicious PDF — malware analysis report

Static analysis result for SHA-256 340d36a2569518ac…

MALICIOUS

PDF

52.6 KB Created: 2021-06-09 07:39:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2be1f36a05e3f171a0ef10b6d03c6670 SHA-1: b935f786357f95bdefb0926de77eea7a03b38a78 SHA-256: 340d36a2569518aca5ef542e7b6f27dfcd1ca6000cccdb1a764dd685c42c1b2b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux, directing users to a malicious redirector URL. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely to harvest credentials or lead to further malware. No scripts were extracted, but the presence of malicious redirector links and the overall lure pattern indicate a high likelihood of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://netcdn.tw/app/431946152/only-working-way-to-get-free-robux-in-roblox-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-noob-army-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-pokemon-go-accounts-level-30_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-bee-swarm-hack-for-treats_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005231.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5231 25400 bytes
SHA-256: cdfa62c41e55907a8d4d930dbe3a9b793f68d36a6af95afe5f05bb937b50f6da
font_01_sfnt_off00008cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBA 4008 bytes
SHA-256: 515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593
font_02_sfnt_off00009a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A41 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA753 19376 bytes
SHA-256: 29a0bf13fcf236a1b896bbc853deaf5d52fa64cc0b8f10d2d3034158e8da6ec0

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