Malicious PDF — malware analysis report

Static analysis result for SHA-256 678f28d0436dc891…

MALICIOUS

PDF

40.2 KB Created: 2021-05-21 02:21:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a35fbd7b6ff781c40817107981cac1c SHA-1: 57136b210f53e9d65cc8307b77403a3d4f4fe0c3 SHA-256: 678f28d0436dc8915b90da29ef4bc577d9ed15b313d782596c9acc8c1d58d07b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, disguised as generators for free in-game currency like Robux. The document body explicitly mentions 'free Robux' and 'game hack', and includes a call-to-action to access a generator. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7829

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.xyz/app/431946152/who-to-get-free-robux-game-hack In PDF document text
    • http://ivanitskyvs.ru/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.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_off00003449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3449 26148 bytes
SHA-256: 89d9aca5e002063a5b1812f0163b19a5dfafcf44aa241ef83bf380f318fe165a
font_01_sfnt_off00006efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 3464 bytes
SHA-256: 8e24205afdd13dcdea98f8150ef77dee4030e0e50a7c748783d1b4598e034a20
font_02_sfnt_off00007b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B32 18484 bytes
SHA-256: 7ba6f7de64c6d8ae6f5469fb20d9bd46bb355649f5c0a9ce8a2cee34149577d7

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