Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9248381a5fe72f…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 05:52:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 20e4175e5cf510379ee853e6e0a13dd7 SHA-1: 36904483ac12a0deeb8d8cc89eea9c0e6b3b8aa5 SHA-256: af9248381a5fe72f8ee3705f933a5bc7a2b0976f4265991e1a2354f40b177065
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The heuristic firings indicate these links lead to malicious redirectors and a link farm, suggesting a coordinated effort to drive traffic to potentially harmful sites. While no scripts were extracted, the document's structure and embedded links strongly suggest it's designed to trick users into navigating to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/im-hacking-your-game-roblox-id-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-hack-someones-account-in-roblox-easy_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-minecraft-servers-to-join_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_off00005347.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5347 27932 bytes
SHA-256: 4e4faf7fe6fa7d4ba68fcbd7f72060ced0dfa1317279c7dd877aa22a7a6caccd
font_01_sfnt_off00009138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9138 19328 bytes
SHA-256: 994caf1ec3d0dcd1ea8de5829b8a1972e3bfaa18a0f537668c73c84d846ede62

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