Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f0b0457ba98794…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 22:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 251188eb424c501de7b20582ab5320cc SHA-1: 7ee9093df56c1e0c1ca72e6f9b0144fc0f9d61f7 SHA-256: c7f0b0457ba9879400613b1e5321a00c4c78cc198b54c399d1bd8c5803902f6b
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=ho%2527oponopono+frases+portugues, which is also listed as a malicious redirector. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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.me/wix?keyword=ho%2527oponopono+frases+portugues
    • https://static.usrfiles.com/ugd/b8c837_45f32cf3ec2948f5b6d9871cdedec016.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_390657d8830e45fcbf3b6b69cb64c162.pdf
    • https://static.usrfiles.com/ugd/696b8a_3480d525769a42ebb124b1f2c6691b13.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/tobenufumawugine.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/tiwerakudilip.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/anabolism_and_catabolism.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/fazomemugeza.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/xeviterizanixovidobu.pdf
    • https://static.usrfiles.com/ugd/e73fea_1f6b3744b28d48be9951521acb1a18d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_24cb71bbbc564c1cbb2561a0e2439c05.pdf
    • https://static.usrfiles.com/ugd/b8c837_e78e36a1c22747dcb339d72b2da3f9c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd06bd06baf434aa44f185218b28860.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_off00005f30.bin
253d8c9377cef87e713e6a7a91d4860e19486477921d8e6fdd63e2a4ae51f7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 5032 bytes
font_01_sfnt_off00007056.bin
298e807816962360496a289757441f74329b47326cbe4d38efe6c11aca93e7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7056 2468 bytes
font_02_sfnt_off00007b18.bin
5eed3bead476efde3a0cd8a2bffaccd25925c818b5eae217f79a02f5c6fae4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B18 9792 bytes
font_03_sfnt_off00009ca7.bin
323fa082d2dabeec19b81c9059fc57ece3455ccdacdc086a5bc0a319d596d0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA7 16324 bytes

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