Malicious PDF — malware analysis report

Static analysis result for SHA-256 781ceb3ba84ce197…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 16:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1f0954007d46f5cf9d3ad728ae266840 SHA-1: c93cdfe86a1de7587d81fc5539ff233fb658a6e7 SHA-256: 781ceb3ba84ce1973172b77c7561f1406e4446a1647d5406be73a10a7b9b4781
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to websites offering game cheats and free in-game currency, such as Robux. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links points to known malicious redirector infrastructure. The document body and embedded links suggest a lure for users seeking exploits or hacks, which is a common tactic for credential harvesting or malware distribution. No scripts were extracted from this sample, but the extensive link farm and malicious redirector firing strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.xyz/app/431946152/blox.page-free-robux-game-hack In PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004972.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4972 29468 bytes
SHA-256: aac41a34ab0bd8e7912983302bd306278d53f3f710069263aeb4a7a5cf44b779
font_01_sfnt_off00008ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACE 18848 bytes
SHA-256: 477bf2ef93abdd264292ffad6df1a1b97b65e35661cdcc3b49278aa82d19b07c

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