Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca41b15a134b700…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 19:41:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cdc12b936bb4bfa21cf1b01a2846c2ec SHA-1: 056c2b93cb21b05f23f010fc8a48fb7c5a01e14b SHA-256: bca41b15a134b7004ab1a7604b3d062addd0bed68d3cf8084573d7a264a2f324
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors and lures users with game hack generators, indicating a phishing or malware distribution attempt. The presence of a 'password-protected archive handoff' heuristic suggests the linked content may be an encrypted payload, further supporting a malicious intent to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/406889139/coin-master-tricks-game-hack In PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-picture_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_004_off00005016.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5016 25216 bytes
SHA-256: c08e546e9850e27f7bc03c92ce3964a53cc89b9fe954af4362990e3c9b5a6bd9
font_01_sfnt_off00008a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A52 2944 bytes
SHA-256: 06c0323016b6b02ad316e898f05517d621c65dc58604f3822104f87707123cfb
font_02_sfnt_off0000947d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947D 17716 bytes
SHA-256: 72c9dca3f555d15cf680f05a17c83eea5c84cf549c22ff1a640312a233055f15

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