PDF malware analysis — malicious · f0b02ac4a044b02c

MALICIOUS

PDF

31.6 KB Created: 2021-07-19 20:06:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 3291e6018a1637c18a5215814d05fa75 SHA-1: ce59812d307f52ca50ad062ff354404626a1238f SHA-256: f0b02ac4a044b02c3f1d30f8034804702dc50f7d50a8f203ec35057db9f78e54

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'free generators' or 'game hacks' for popular games. The primary lure directs users to 'http://netcdn.tw/app/406889139/free-spin-link-for-coin-master-game-hack', which is flagged as malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to trick users into downloading further malware or visiting malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/406889139/free-spin-link-for-coin-master-game-hack In PDF document text
- https://kupidrbpz.hr/images/free-robux-co_GM431946152.pdfIn PDF document text
- https://kupidrbpz.hr/images/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
- https://kupidrbpz.hr/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
- https://kupidrbpz.hr/images/robux-hack-me_GM431946152.pdfIn PDF document text
- https://kupidrbpz.hr/images/rbx-free-robux_GM431946152.pdfIn PDF document text
- https://kupidrbpz.hr/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
- https://kupidrbpz.hr/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://kupidrbpz.hr/images/minecraft-education-free_GM479516143.pdfIn PDF document text
- https://kupidrbpz.hr/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://kupidrbpz.hr/images/freer-pro-tiktok_GM835599320.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
`stream_002_off0000275b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x275B	22792 bytes
SHA-256: `a42c53a2ce33805d67dbda88574857c8ff0d1a81c9a8587f2de97cd25b8f4cb1`
`font_01_sfnt_off000059ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x59FF	18056 bytes
SHA-256: `b406b504177f6b640bc1dbcd325e02770f8a0621b64b682f119f0b5c1d0e735d`

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