Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6fdef2368b3dc…

MALICIOUS

PDF

43.4 KB Created: 2020-08-31 10:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a554a0fcacc78f03a396ea8ff3532d22 SHA-1: 8d1a8e37f8fa256857eedc2f6a98b3d1cc096107 SHA-256: 88b6fdef2368b3dc858a11ec4fa780ebd91a302f196f7d013cecf9e69837b681
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a phishing or malware delivery attempt using a lure related to a book title.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=the+lost+bible+igor+bergler+pdf
    • https://static.usrfiles.com/ugd/b8c837_65578ffde2174e11a61e8ae217c79e0e.pdf
    • https://static.usrfiles.com/ugd/b7082a_1b12ea9c3232441497185b03506ed084.pdf
    • https://static.usrfiles.com/ugd/c8a981_e11c1afc9a0e41d5afc6351758bc7d12.pdf
    • https://static.usrfiles.com/ugd/f523c3_7f63d6f6292a4af9bedc586b5b2082ad.pdf
    • https://static.usrfiles.com/ugd/0d089b_ad298e7adad942adbbcc08bbceb32efe.pdf
    • https://static.usrfiles.com/ugd/18f527_7ed24f0e31c643f38105d4857188ee09.pdf
    • https://static.usrfiles.com/ugd/696117_387c176f9e9a470eabc3bfdcbc2d1400.pdf
    • https://static.usrfiles.com/ugd/a838c0_0d2cf85bd846496497248a4e264c5b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b321b21320a64d7cbcbbbf065576e80b.pdf
    • https://static.usrfiles.com/ugd/ae059d_d89d45e1d74a494eb80d6b8e67a51b8e.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/tukewatur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/how_to_create_a_server_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/adding_fractions_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/braveheart_violin_sheet_music.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_off00006c1b.bin
eb4d02c4ec451c7fb986a4a8896cd123bb6394fac662a693afea499be655226e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1B 5180 bytes
font_01_sfnt_off00007db0.bin
f35f3ccee9b5dc95d099bf1b608061a4861597e1fcc5f052b9e194e598417b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB0 10368 bytes

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