Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60631bee6fdb74c…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 02:07:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f749188e1ea6d60fc001044c48d0fea3 SHA-1: 336b0f0629f2cbd18651b62078dbf6579bf0c32d SHA-256: b60631bee6fdb74c532b480831975089bbd1c906a518383b30b37c1a2ab00795
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, disguised as game hacks and generators. The primary URL, https://netcdn.xyz/app/431946152/free-roblox-hack-us-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'free roblox hack' and 'game hack', reinforcing the lure. The presence of numerous external PDF links suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-roblox-hack-us-game-hack In PDF document text
    • http://pwpyemen.org/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pwpyemen.org/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/free-800-robux_GM431946152.pdfIn PDF document text
    • http://pwpyemen.org/images/free-robux-exe_GM431946152.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
font_00_sfnt_off00004971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4971 25376 bytes
SHA-256: d023effd22aff2d6df18833482708972dc22fbafad16e09528cef006e1500226
font_01_sfnt_off00008222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 18532 bytes
SHA-256: 0d34e375d8902d3efa285fd24fab142d003833d4205c7dc9a730d4d831678389