PDF malware analysis — malicious · 4f2596e6b682a238

MALICIOUS

PDF

36.0 KB Created: 2021-07-09 11:41:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 3539f29a7e986c5eebdc7054cfbb3724 SHA-1: 22cb1240372412006cf7f41e044415660789b8f0 SHA-256: 4f2596e6b682a2383ffbf5019e5b95fefe6df660e650b895014080d3b6ab34a3

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them, promising free in-game currency and items. One critical heuristic identified a link to known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-unlimited-coin-master-400-spin-link-game-hack. The document body and heuristics indicate a scam or phishing attempt, likely to deliver a second-stage payload or lead to further malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.
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.
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 http://netcdn.tw/app/406889139/free-unlimited-coin-master-400-spin-link-game-hack In PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/roblox-cool-and-free-hat_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/free-supreme-roblox-model_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/www-roblox-free-rewards_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/roblox-cheat-engine-fly_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/lots-of-robux_GM431946152.pdfIn PDF document text
- https://elearningmts.pontrenannur.or.id/__statics/gudangsoal/files/master-coin-free-link_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.

Filename	Kind	Source	Size
`stream_002_off00003275.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3275	23284 bytes
SHA-256: `86931baaa49d8f31d887c04a358d1556d3ece97e246460093c4203174a52fd2c`
`font_01_sfnt_off0000670f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x670F	19272 bytes
SHA-256: `582aeb92dd3a331c04b2727d0c078206515a8037cfb1592e5c6b0e96fa0896b6`

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