Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf4654c01026488…

MALICIOUS

PDF

68.6 KB Created: 2020-09-01 13:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c85be5549af4318ccca2fc6b634914e9 SHA-1: 0bb73156cb707d460511734b434c958e4bcfa1e7 SHA-256: 4cf4654c0102648802e25c8d1e9cec02a181336c2486da3235863a0a42509deb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains the URL https://ttraff.ru/wix?keyword=solaris+10+os+free, which is flagged as malicious. Another heuristic indicates a PDF link farm, with the first URL being https://cdn.shopify.com/s/files/1/0432/4560/0936/files/22546110206.pdf. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=solaris+10+os+free
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/22546110206.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/filizibaxibeti.pdf
    • https://cdn.shopify.com/s/files/1/0428/5385/9494/files/wukong_jg_s6.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/kafiwenutom.pdf
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/pibawunewufufavewenebibo.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_1922d033dc5a46c0877135480de8bd80.pdf
    • https://static.usrfiles.com/ugd/43d598_abbd76729fee4e4cb11525cc64bc797d.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/speaking_in_tongues_scriptures.pdf
    • https://cdn.shopify.com/s/files/1/0451/0469/3400/files/ap_environmental_science_frq_2015.pdf
    • https://cdn.shopify.com/s/files/1/0469/0296/8482/files/cmo_limpiar_las_puntas_de_cumplimie.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/wipatamawufavovadanonat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5504/6037/files/facts_about_animals.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/ronukak.pdf
    • https://cdn.shopify.com/s/files/1/0440/7489/3477/files/tobugebidimobig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008eb6.bin
2ca7223a28a33436fad35cc6031cb65f8f21c4f36b839f75c9777d834499b710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB6 14640 bytes
font_01_sfnt_off0000be49.bin
9acd6a8de334066e87b5338c2b7dc1d5f33497550337d1fde0851fe6bc02c0dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE49 5056 bytes
font_02_sfnt_off0000cf86.bin
8e87505002d2c72ff40b65898b23286d1bf1ccfc624b9a82a3296de3ffa2831b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16820 bytes

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