Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec91f034f899ac2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 05:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4fe1964466b103ae1595c58ab313089 SHA-1: 2b97c04ab431006262391023a78af7addb3d9060 SHA-256: eec91f034f899ac2465372aff158a72f639ae8d6705b962c2adbfae9443c3f50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but also includes the malicious redirector URL and several benign-looking URLs hosted on Shopify. The primary attack pattern appears to be a link farm designed to redirect users to malicious content.

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=2gig+default+master+code
    • https://static.usrfiles.com/ugd/b8c837_47b01ea49aa74de1afedc2d82526b3a0.pdf
    • https://static.usrfiles.com/ugd/9c43ec_82858ad9a4954349bece049507421068.pdf
    • https://static.usrfiles.com/ugd/b8c837_559675a73b904d7ba612f4eb3e05f2b7.pdf
    • https://static.usrfiles.com/ugd/55f640_3b955028c4dd433480e429d3adfbe3b3.pdf
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/38008553377.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/daleragejejifapak.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/72112760036.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/jofofitusonelekofilakupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3010/9593/files/40547831365.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/34924490730.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/59462208271.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/gesapoliwufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9497/files/dolby_digital_advanced_audio_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/9228/5342/files/7450502354.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/xikefen.pdf
    • https://cdn.shopify.com/s/files/1/0448/1240/2839/files/bagatelle_pour_un_massacre_celine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b39.bin
152bfeb9e1d9451b800fdb3c46286fa0069f90dcc361b789ba7eb0e7269de084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 5376 bytes
font_01_sfnt_off00007d61.bin
eb11cf7658d449348be763081bee887e7c2ac99cd9da3ca5f0d7183e695d1368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D61 10480 bytes

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