Malicious PDF — malware analysis report

Static analysis result for SHA-256 121094f99daaa741…

MALICIOUS

PDF

47.7 KB Created: 2021-05-13 05:04:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2ff22ec2f4bb2c1240db3ce69ff74238 SHA-1: dda53758229975b8df26e79eae16e40ee6d7b85b SHA-256: 121094f99daaa741d72fdd742e9dfe89007df866dd9a94ba0a7238c7e5f12c8e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising free Robux or game hacks. The document body and embedded links suggest a lure to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/free-robux-without-offers-game-hack In PDF document text
    • http://apkmaykop.ru/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://apkmaykop.ru/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://apkmaykop.ru/images/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://apkmaykop.ru/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/free-spins-coin-master_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_off0000492e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492E 28584 bytes
SHA-256: f4108ce101213751af7acbaba8314fc0fc93fc8e403c2b323bb3230dcc933d86
font_01_sfnt_off00008a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A52 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000096fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96FA 18600 bytes
SHA-256: aefc65dd28f007a3f9b16d2e7d3f040b6593358131967176ac90892bab7f0013

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