Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdf0bfe1523df8c…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 09:30:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 664827f0ffe086564398a391a42268fc SHA-1: 191e916ab9fdf210d6ebb2d1fb05b4380116f791 SHA-256: afdf0bfe1523df8ce8495e7de826f41a8fc5b4bddcaebf8e99d5b3b2bfb42e29
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector infrastructure, designed to lure users into downloading potentially harmful files or visiting scam websites. The document body and extracted links suggest a focus on 'free Robux' and game hacks, a common theme in phishing and scam campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-robux-legit-game-hack In PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-tiktok-accounts-with-2021-fans_GM835599320.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/minecraft-pe-free-download-ios_GM479516143.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_004_off00005067.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5067 25980 bytes
SHA-256: cf920a8c9976db1a0eb9b8b5ac4efc408ab5793241dda57a5cd9de34239f6bd6
font_01_sfnt_off00008b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B98 18528 bytes
SHA-256: aa02e962ea97e6ca8489eff7fd27dc9c81bb0b76c5ed523337a23ffa677521ed

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