PDF malware analysis — malicious · 41f86bcaec1c6422

MALICIOUS

PDF

32.8 KB Created: 2021-07-06 17:25:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 92f752656fd52eade2b29963429ee87e SHA-1: 0643658be6de761e13896e4b460a3651a07a718a SHA-256: 41f86bcaec1c64225d2e921bee0f359e1d521ac0560b2da7d292486f2775a9fa

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free Robux and game hacks to entice users. It contains numerous links, including a primary redirector at http://netcdn.tw/app/431946152/how-to-earn-free-robux-game-hack, and a large number of links pointing to SEO-optimized PDF files hosted on elearning.mtsn1bandung.sch.id. The presence of a visual download button further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

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/431946152/how-to-earn-free-robux-game-hack In PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/hacks-para-volar-en-roblox-2021_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-robux-code-giveaway-live_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/roblox-free-promo-codes-not-expired_GM431946152.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/adfly-hack-robux_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-robux-from-ads_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-stormtrooper-helmet-roblox_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/cheats-on-natural-disater-survivle-roblox_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/vest-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-speed-hack-las-vegas-on-roblox_GM431946152.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
- http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-real_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
`font_00_sfnt_off00002c0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2C0A	21768 bytes
SHA-256: `b7bd102d287d8ff0160110ec105f313ffb68ef3279774b7230bfb09d4069391a`
`font_01_sfnt_off00005bf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BF2	18880 bytes
SHA-256: `a522bee010909c1dfdd5b814bfadf8c7715ebc59745b399d37c475b37c42e617`

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