PDF malware analysis — malicious · a3b2af2dc18d164f

MALICIOUS

PDF

38.8 KB Created: 2021-07-03 15:35:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: d4717857766d5a69056eba18b1bccc39 SHA-1: d6835600e77983f5faef6b04c9480a716ba396df SHA-256: a3b2af2dc18d164f1bba7816be9e4f5bd96c5eebe1faf69d4bd5b5228faf9afa

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering free game items and currency, with one link pointing to known malicious redirector infrastructure. The document body and embedded links suggest a lure for users seeking in-game advantages, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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/coin-master-free-spin-today-game-hack In PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/pubg-uc-20_GM1330123889.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/free-roblox-gift-card-codes-2021-march_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-get-fly-hacks-in-roblox_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-use-inspect-element-to-hack-robux_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/roblox-moderators_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/cheat-engine-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/tiktok-for-free_GM835599320.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/hack-for-roblox-dll_GM431946152.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
- https://mawaridschools.com/uploaded_files/userfiles/files/free-robux-no-verification-no-survey_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_002_off000036a3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x36A3	22908 bytes
SHA-256: `492cec65ef3463fafe97eb97d93852d8a1b966b00ccc68a6db20d38e1e9812b7`
`font_01_sfnt_off00006a18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A18	2896 bytes
SHA-256: `c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd`
`font_02_sfnt_off000073fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x73FD	18528 bytes
SHA-256: `611292c7b78d9aef83f236a5f61e8588922333099173db31565d3b831f2ee55a`

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