Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ffa055aa13bb2f…

MALICIOUS

PDF

35.5 KB Created: 2021-05-23 04:08:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 29eb18d04e7f0bf35ac67b4f84acfa37 SHA-1: b4c116789002d641cac6475b69cb6f97a42130a2 SHA-256: 61ffa055aa13bb2f87daec72dd30fd769fba9288d08d80d8e63c9d79abe56071
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free coins and spins' for games, which is a common lure for malware distribution. The ML classifier also flagged this PDF with high confidence. While no scripts were directly extracted, the embedded URLs suggest a workflow designed to trick users into downloading further malicious content, likely through a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/free-coins-and-spins-for-coin-master-game-hack In PDF document text
    • http://aessentia.com/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/get-free-coin-master-coins_GM406889139.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.

FilenameKindSourceSize
stream_002_off0000316d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316D 24872 bytes
SHA-256: 26af3b234a810fbe3ec38dbc49c4a416d5581a543c77589daf558796eb124439
font_01_sfnt_off00006a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A20 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

Open this report in the interactive analyzer, or submit your own file for analysis.