Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d7f6212f6ac859…

MALICIOUS

PDF

73.2 KB Created: 2020-08-31 06:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d49c263cd736f4edda20fcbb6618ba75 SHA-1: ed668e5506d862c2b88a053c4669b59bd3b014ff SHA-256: 51d7f6212f6ac8590220e0b20a4808f34c53a2c135548f2d87262d326f80c015
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, another critical heuristic identified a PDF link farm, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/wix?keyword=naruto+ultimate+ninja+storm+impact+f
    • https://static.usrfiles.com/ugd/c8a981_23a798884b8d4c26be9dd48729b33b86.pdf
    • https://static.usrfiles.com/ugd/b80405_c31f1aecbc4d43f0b8edb1986d51e4b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a77677dbcb4b448a8aa4d3c41675b922.pdf
    • https://static.usrfiles.com/ugd/824332_aca63732ae2340d687bdc083104a6396.pdf
    • https://static.usrfiles.com/ugd/b8c837_54aff90327a942fe8d998f90f4cc31ad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5755/2277/files/rorugipexaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/manual_actualizado_de_cateterismo_cardiaco_derecho.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/58176011945.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/76961069358.pdf
    • https://cdn.shopify.com/s/files/1/0462/1710/1466/files/hotstar_app_apk_2019.pdf
    • https://static.usrfiles.com/ugd/b7082a_b516fb4f9b724bd4a3f065a6c65e8e9f.pdf
    • https://static.usrfiles.com/ugd/2f8cea_b36bcbd8cd814c40b9d7bf50e827c5f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce3a433c7964429c889da22b82d5d1e8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad1f.bin
8950b0a0b986ec04b37d44b02933e96cb84114cd44ef3be8cebbe712ab44f9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1F 11792 bytes
font_01_sfnt_off0000d3bf.bin
8db728eb4b84a591d1c4d56a669a4c895e32e8832841fa1ea67e1be9d75e6562		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 5088 bytes
font_02_sfnt_off0000e4fc.bin
ca29f8182cccb808b848e23a6f49e882843cfa6db8b69c572864534e9393a7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 10708 bytes
font_03_sfnt_off00010968.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 4324 bytes

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