PDF malware analysis — malicious · cff4b5985e901d2a

MALICIOUS

PDF

43.4 KB Created: 2021-05-10 22:51:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: bac17339b63c9884a1e74c03eb9336c9 SHA-1: 8e9631ee4ce538be703a2a7fd5098c92d781b834 SHA-256: cff4b5985e901d2a14ef1c6708eead3d57422997abb81ff636a4aca98a949bdd

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest a phishing campaign designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9648

Heuristics 4

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.
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-hack-tool-ios-game-hack In PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-mod_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-minecraft-server_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/get-free-robux-info_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/roblox-free-draw_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-hack-coins-in-archery-master-3d_GM406889139.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_off000048b1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x48B1	23744 bytes
SHA-256: `bdb64dbd731f0543fcb954a362aa8baf13739215988c7866d631fa416a3556f8`
`font_01_sfnt_off00007e71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E71	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off0000885b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x885B	17788 bytes
SHA-256: `4f2a38718d9989b5298901949fd418d07efa2361880d56d3118be161e3e9b85d`

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