Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2738b42e9a7c7e0…

MALICIOUS

PDF

46.2 KB Created: 2021-05-12 03:40:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 209e1d8dbbd9caabb8692b122c5fab48 SHA-1: 2ec2364cbb2be5ad015bc97beee4921ee4aeec63 SHA-256: a2738b42e9a7c7e0840270af93a415461bcefea8ace5c6cec64e5620449a5890
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and free currency. The primary lure is to trick users into clicking these links, which are identified as malicious redirectors. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/how-to-get-free-spins-on-coin-master-blogspot-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C9F 25716 bytes
SHA-256: 43ec1c2b058c9d662e6cb082ac15d30560d6e4bb3e7951c757c52c06e51cde17
font_01_sfnt_off00008749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8749 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00009134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9134 18628 bytes
SHA-256: dffdff87eeabeaf08b6b0d7b886c4f721907d6ee2cd896e9e47cad489ce70e41

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