Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea32cd54fbc0b54d…

MALICIOUS

PDF

46.4 KB Created: 2021-05-19 20:15:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: de1af0dce02722df03fc3b20618dd727 SHA-1: 7cb2f0d4759e7dca324ea076198c9ee38410d98d SHA-256: ea32cd54fbc0b54d5dad53c047859945815cc36b213ad41ce196e72b457bfbfd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains references to 'Coin Master Free Spins' and URLs that reinforce this lure. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/coin-master-free-spins-and-cards-game-hack In PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://bit-sky.com/images/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-apk-2021_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
stream_003_off00004afe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFE 27472 bytes
SHA-256: 62c51dbde06f768359b466e8f27d2afeda8e0ad39b74dae265f2b9723cd33ab2
font_01_sfnt_off0000893b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893B 3016 bytes
SHA-256: 9e1846451a642af883aeca33641a78f64a02331e30818de75fc80db1bdf14ecf
font_02_sfnt_off000093b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B3 18060 bytes
SHA-256: 7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7