Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f288611a1e2bec1…

MALICIOUS

PDF

45.8 KB Created: 2021-05-15 06:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c2f3653368d1efba27b428e9fcdccae9 SHA-1: 233906332ddacb66c9175d00171c88fc5647ec4c SHA-256: 6f288611a1e2bec130dead07153a6892f4f2c1f47398c64d6845c5fef7f00da1
280 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that promise free in-game currency and hacks, a common lure for phishing and malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of multiple SEO-optimized PDF links suggest a coordinated effort to drive traffic to potentially malicious sites. The document body, though obfuscated, contains URLs that align with the lure, indicating an attempt to trick users into clicking through to these sites, likely for credential harvesting or further payload delivery.

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.
  • 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.xyz/app/406889139/free-coins-for-coin-master-blogger-game-hack In PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-buy-robux-for-free_GM431946152.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_off00004bab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAB 25460 bytes
SHA-256: a275096a55645b74fb393007080becb66a418fb009f430baa1bf142e8c035ee6
font_01_sfnt_off000086e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E5 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9096 18288 bytes
SHA-256: 525699ae71861fffeab431a07c950b4914d38a871fb98becad0e0bea9ac3f1df

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