Malicious PDF — malware analysis report

Static analysis result for SHA-256 c511e61a4a5caa40…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 09:28:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3848e4c76f410a59d16953a133f5fde7 SHA-1: bdf7145bc38d30fd5cc1d33bf09a5f2fe6d6623f SHA-256: c511e61a4a5caa40ebb79cd0ecb0452b0e91b581faf3c71e1da556140bea2ecd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors, specifically promoting "game hacks" and "free generators". The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with a lure for credential harvesting or malware download. The primary attack pattern involves tricking users into visiting these malicious links, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-free-soins-game-hack In PDF document text
    • http://www.hlad.hr/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-re_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000538a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x538A 27420 bytes
SHA-256: 229f30a9d09c4e36214bab9f06d93e77a9dbb021c46ad000eab5f866c9d70c65
font_01_sfnt_off000091b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B3 17712 bytes
SHA-256: a621fa0cf6ecf429ccb0e9762dad0d1971a2824e8730eca88621f5efe7e14995

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