Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d38df829adea117…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 08:30:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 186b7df29981d0938a8bfe0365f49669 SHA-1: d2cd25683afdfc77447a1ff3c926659232160fc8 SHA-256: 4d38df829adea11775e6f991d92fc2b6dd003af5e2909ca8bdb6be07ddcec86f
228 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on them, disguised as game hacks or free item generators. One primary URL leads to a known malicious redirector, which in turn hosts numerous other PDF links, suggesting a link farm designed for SEO poisoning or traffic redirection. The document body, though partially corrupted, contains keywords related to games and hacks, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/minecraft-packs-free-game-hack In PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coun-master_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/earn-robux-sites_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/real-free-spins-for-coin-master_GM406889139.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_004_off0000519b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519B 24896 bytes
SHA-256: 8378a2d6d1eb0b94aca4981356fc75a344ba4823fc8599700de188281b8ae439
font_01_sfnt_off000088e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E3 2856 bytes
SHA-256: 20dc0c19885f9eb84a70adf762c7af2bb5b336981fcfa4d14a25b177438c211a
font_02_sfnt_off000092b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B7 17892 bytes
SHA-256: 28bf341ddf3e4fc6c44bfb74e5ae7c03e5884bb4772c75cdbdc503afd42c19ec

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