PDF malware analysis — malicious · cb47ad76dc4befe2

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 07:19:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: b6ac59a472c0da06b165e6eb1ed5a6cb SHA-1: 141e030ad1fa767cf03e6d701df93214446fc46c SHA-256: cb47ad76dc4befe29a5519e8a281fbfafe3e1d417f86aabd204a99588e08e29a

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The document body and extracted URLs suggest a phishing or scam attempt, likely aiming to trick users into visiting malicious sites. No scripts were extracted, but the presence of multiple malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9632

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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 https://netcdn.xyz/app/406889139/coin-master-free-coins-generator-game-hack In PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/coin-master-freebies_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/roblox-robux-page_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/blox-rewards_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/roblox-hack-game_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/free-minecraft-client_GM479516143.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/minecraft-font-free_GM479516143.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/coin-master-free-link_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/free-robux-live_GM431946152.pdfIn PDF document text
- http://elearning.minailululum.site/__statics/gudangsoal/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00004a04.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A04	25360 bytes
SHA-256: `83e87914d72f8abb24e4ee6e19ea7d3315a71154b1f7ed2241fa6443fd5fbfe4`
`font_01_sfnt_off000083ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83CE	3400 bytes
SHA-256: `4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07`
`font_02_sfnt_off00008ef8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EF8	17712 bytes
SHA-256: `f6b7bbb27796bfdd91832c5c9631b2ef3c604ec4967bc220e21b541acce31e79`

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