Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b53111f32409cc…

MALICIOUS

PDF

35.2 KB Created: 2021-06-20 03:39:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7d69a1a9ae835b610070b428ef508e4c SHA-1: 0de14335222d9e3a545e0ac5b5c34986056f620a SHA-256: a6b53111f32409cc3c9c5b9f5682e8fd8741ecf8f942c6c6815aeb711cf8b37f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.co/app/431946152/free-r-free-robux-robux-robux-free-game-hack PDF link annotation
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/cheats-for-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-punch-animation-roblox-r6_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-valkyrie-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-sell-t-shirt-for-free-roblox_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_off000031b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B7 22948 bytes
SHA-256: 66ab9e6145480230c033a43ebf25f9c34ad108e87fcb525bc2c208b8f198a332
font_01_sfnt_off00006575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

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