Malicious PDF — malware analysis report

Static analysis result for SHA-256 0508774c13f36308…

MALICIOUS

PDF

46.6 KB Created: 2021-05-25 08:02:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fb0db7e27012d97b9472ad00e12768bd SHA-1: 542daedfea0136aa783810825e37e4798612c1ec SHA-256: 0508774c13f36308bd09250bf5b4fd710f47af33e15ed61d51285ef71e5d96d2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free generators' or 'game hacks', specifically mentioning Robux and Coin Master. One critical heuristic identified these links as pointing to malicious redirector infrastructure. The document body, though partially corrupted, also contains similar lures and URLs. The presence of embedded URLs and the nature of the lures suggest an attempt to direct users to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7714

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/how-to-get-free-robux-without-verifying-game-hack In PDF document text
    • http://handimanlibrary.org/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000036cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36CD 29052 bytes
SHA-256: 7dea959ef40c8770cd72cbe0d3938ddc25f5059295902533782275a443971893
font_01_sfnt_off00007898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7898 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00008434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8434 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9145 19368 bytes
SHA-256: 63de63cfc252acdf530e8b3b2390dbc20d855d9653817057ed506b48c41b68ab