Malicious PDF — malware analysis report

Static analysis result for SHA-256 71818a8eeeefe557…

MALICIOUS

PDF

46.7 KB Created: 2020-08-10 15:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f7fb2288d314b9eb74914775860af38 SHA-1: fb2eb840a7cbdefd7a57658492cd68d1e68750d9 SHA-256: 71818a8eeeefe55704160ae42ad1c3a300f815a8139a22baaceb5b949fceb663
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains text suggesting it is a chart or tutorial, likely a lure to encourage clicks on malicious links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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.ru/pify?keyword=metal+melting+point+chart+pdf
    • http://files.innerfireherbals.com/uploads/1/3/0/9/130969051/kelopeg.pdf
    • http://pekobo.helenaeloisephotography.com/uploads/1/3/0/8/130814328/pawuzibarosezude.pdf
    • http://files.jalascoaching.com/uploads/1/3/2/7/132740172/6927187.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/37275516901.pdf
    • https://cdn.shopify.com/s/files/1/0445/8453/4180/files/automatic_capsule_filling_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/92889996899.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/linux_shell_script_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/12226197943.pdf
    • https://cdn.shopify.com/s/files/1/0436/1266/8066/files/wedese.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5754/files/90814967540.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/82990727564.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/64437175843.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/artocarpus_camansi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/8550320882.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/archie_comics_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/kukadujuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/wulazibirarajabatotifa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/werijadij.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_off000068f9.bin
1eec06d8136e90056fdf199d24202f9bf4eada0f7b1a084302124640f1b9241b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F9 5396 bytes
font_01_sfnt_off00007b26.bin
9732646fd440d6a61225bd00f80eb98a84402f4ed6c63e4fb5e19129271a6bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B26 15976 bytes

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