Malicious PDF — malware analysis report

Static analysis result for SHA-256 823e3bc51bf3c0ec…

MALICIOUS

PDF

49.1 KB Created: 2020-08-31 09:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6718b8d4279399d0a6cfe0bd3b0df6 SHA-1: 1560acf6035f5325da74e72fe5e0b1351f873346 SHA-256: 823e3bc51bf3c0ec2537c5b0175797544788e0716d378017c6e2782f8ef79382
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into visiting a site that likely hosts further malicious content or exploits.

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=mejores+cleo+mods+para+gta+san+andreas+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1389/7368/files/suxeboledalagis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5829/files/govidufow.pdf
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/science_brain_teasers_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/79421545702.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/39140424362.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/vijulud.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5368/files/lexus_rx_2016_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/rimojugedax.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/non_alcoholic_cocktails.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/eclipse_luna_ide_for_java_developers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/nukuxow.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/85449495526.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007841.bin
7918d1489c0291805b06afc823b14d0bace5c86ee2db4a9fc89ce8cc468d7273
pdf-font-stream PDF embedded font (sfnt) at offset 0x7841 5476 bytes
font_01_sfnt_off00008ada.bin
cd01088203deee59c2fd413f9b202364a24647c083cf59fd02e5345fdc8659eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 14360 bytes