Malicious PDF — malware analysis report

Static analysis result for SHA-256 2307f4fb817645de…

MALICIOUS

PDF

43.8 KB Created: 2021-05-12 00:42:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a56b796882830afc2e3d4363d715f31e SHA-1: b6369223268b59e4a65ae1af2b6e04820610337e SHA-256: 2307f4fb817645de38e321c823cb641785d464113b2da3aaa264a6c1cad344aa
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks and generators, but which lead to malicious redirectors and link farms. The heuristic firings indicate that the PDF is specifically crafted to exploit user interest in free in-game currency and hacks, directing them to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/apk-coin-master-hack-game-hack In PDF document text
    • http://zercalo.org/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-human-verification-or-survey-2021_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
stream_003_off0000480e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480E 24420 bytes
SHA-256: c94920692285203ac787ecdc4551fd4835c22b0358b08a5c471f41e47bae168d
font_01_sfnt_off00007fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD7 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off000089c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C2 17892 bytes
SHA-256: 10848dcb94fa8ef52647dff51f313a82fe0a75c442c4a6ae41e72789ca7f1d9e

Open this report in the interactive analyzer, or submit your own file for analysis.