Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c665ab3103c382…

MALICIOUS

PDF

45.8 KB Created: 2021-05-12 15:33:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 199b7f13469035e683b85afc175e54dd SHA-1: 36117239b1436d53c89a10c1c57b6b91abbee5d8 SHA-256: 33c665ab3103c38236012001db3daf2a662327ec92dda2da71a1de84ffdcc879
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that appear to be part of a link farm for game hacks and cheats, including specific references to 'free Robux' and 'Coin Master' hacks. The presence of a lure for MFA harvesting suggests an attempt to steal user credentials or session tokens. The document's structure and embedded links indicate a phishing or credential harvesting campaign, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/websites-to-get-free-robux-game-hack In PDF document text
    • https://miraller.com/upload/files/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/wurst-client_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/robux-cheat_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-shield-hack_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_off00004aa0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA0 24560 bytes
SHA-256: 5697cdcfe813908920c9a527a546119764447373a2da66304d2a2c860b44e1a6
font_01_sfnt_off0000832f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832F 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD6 18436 bytes
SHA-256: 6ab9ab31980840835fbaeca164a74f0e8188db39a6ce5c5e4face3e95ba0b523

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