PDF malware analysis — malicious · b6ba1224e10488c5

MALICIOUS

PDF

43.0 KB Created: 2021-05-19 14:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 89311a43877694dc87a39ce068ca4ae9 SHA-1: af7dd20d9bd94c98c2e5e85743fdfabc216cae7d SHA-256: b6ba1224e10488c5301b19cd1e514e4e0df967def9310e1f27d8d8a763f9eac1

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 brand-impersonation credential phishing. 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 0.9971

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.
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/free-coin-master-spins-daily-game-hack.
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/406889139/free-coin-master-spins-daily-game-hack PDF link annotation
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/getrobux-come_GM431946152.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/roblox-hack-site_GM431946152.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
- http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/robux-today_GM431946152.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.

Filename	Kind	Source	Size
`stream_003_off00004b46.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4B46	25112 bytes
SHA-256: `20fc8829523d5de34e00c44adf5c7987dfdb0d94277049bffb2d7591c521c257`
`font_01_sfnt_off0000858e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x858E	18308 bytes
SHA-256: `55b350ba652cc81c58cde26cd3be3a49d0b7ceb69ba015e6646fbbf561effc1c`

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