PDF malware analysis — malicious · bcba1c48230d9e3c

MALICIOUS

PDF

49.9 KB Created: 2021-05-10 16:35:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02

MD5: 61f30f331b5650c5dba2739a7a2461a2 SHA-1: 5a6df4c2d2a80392187fae414a0d27b19e0bedbf SHA-256: bcba1c48230d9e3c724cf7dfe92dd72121064d0b4dec9ff6f67e6b089911bd5c

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 fake-CAPTCHA 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 0.8642

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/431946152/is-roblox-free-on-xbox-game-hack PDF link annotation
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/spins-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/easy-robux-generator_GM431946152.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
- https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00004dcd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4DCD	25188 bytes
SHA-256: `e995a1078488e0d522b0445122dba38fd0af1af9bbd73ef057f9cf3533a3cdcc`
`font_01_sfnt_off000087f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x87F9	3964 bytes
SHA-256: `f6b9a386ee4e0aff622a98b2230905da71eab0ca98398cb52018fda3528d3e2a`
`font_02_sfnt_off00009557.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9557	3396 bytes
SHA-256: `e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee`
`font_03_sfnt_off0000a14a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA14A	17948 bytes
SHA-256: `b3ba82aa7ee3d7aa0ce4ddaa3eca5cb497d3e48713e942ef8c08a7410c5f198f`

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