Malicious PDF — malware analysis report

Static analysis result for SHA-256 77198f3abd4c99b3…

MALICIOUS

PDF

35.5 KB Created: 2021-07-21 05:10:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e0703ef9b01df1c06ad54f1e2bdf1593 SHA-1: de7f27dd415ea0b5c3967d74889a6f8413019aa6 SHA-256: 77198f3abd4c99b36f0a9bae0a3ff1e2969c43c594d1065f7638fd2fddff802e
160 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, with one specifically identified as a malicious redirector leading to a "game hack" lure. The document body also contains a call-to-action phrase, reinforcing the deceptive nature of the content. The presence of these elements strongly suggests an attempt to trick the user into navigating to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-free-spins-promo-code-game-hack In PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003315.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3315 23452 bytes
SHA-256: a4e116a92f4f8ecedbc7cd047837ed453d194a1038c904233b58c34fd4a40a40
font_01_sfnt_off0000685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 18476 bytes
SHA-256: dc3ef91c42b56b19e880a129857b9cc4209ff723fc15082788877c1745c42c0a

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