Malicious PDF — malware analysis report

Static analysis result for SHA-256 08492067c858a663…

MALICIOUS

PDF

45.3 KB Created: 2021-05-12 12:48:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bf355dec4f0c535aa71aee9377194c0f SHA-1: 14aa0b631408e43a615a7d92bced5f3494a85b7b SHA-256: 08492067c858a663a03a6f2e51b20cfb123e64892c87968045657baf0a9d0c42
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/how-to-get-minecraft-for-free-on-iphone-game-hack PDF link annotation
    • http://iacfhouston.com/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/earn-roblox_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://youtuIn 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_off00004aa2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA2 25856 bytes
SHA-256: f479b2ead2939affcfe39f2fbee80f82f2a9c5f01edeb9fc247b0e5647836512
font_01_sfnt_off00008525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8525 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED7 18216 bytes
SHA-256: bed6c76176a434f358ebc88a31d2dbe88cb1547cd8758d4c9ade2f80066016aa

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