Malicious PDF — malware analysis report

Static analysis result for SHA-256 7072432aac9c58e3…

MALICIOUS

PDF

44.8 KB Created: 2020-08-08 12:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90da5b49f88e2c38cd415031f8454123 SHA-1: a7204dd3515a016732639770f388c1bd91ec9df6 SHA-256: 7072432aac9c58e398aba56cc36fcf057d2a712edcb9084ec1ad477a65384a2a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external resources, suggesting a link farm or redirection scheme. The primary malicious link, 'https://ttraff.ru/pify?keyword=nitro+pdf+blogspot+download', is identified as a known malicious redirector, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains references to 'Nitro PDF' and download-related keywords, reinforcing the lure. No scripts were extracted, but the presence of a malicious redirector and a large number of external links strongly suggests a phishing or malware distribution attempt.

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=nitro+pdf+blogspot+download
    • http://files.oaklawnbaptistchurch.org/uploads/1/3/0/7/130738524/b9f86b3.pdf
    • http://files.ericamesser.com/uploads/1/3/0/7/130740624/3f9387e55a5bb8.pdf
    • http://files.standrews801.com/uploads/1/3/0/7/130739779/fexalirezi.pdf
    • http://files.joekreszfitness.com/uploads/1/3/1/6/131637021/984c478f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8244/0103/files/gelamiwakesunupur.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/fesud.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/47315662332.pdf
    • https://cdn.shopify.com/s/files/1/0438/8736/2216/files/zeritibad.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/rujudujudobevowalijamefad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/38844156438.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/sulufakedidowujeputekopev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/physiology_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7609/1045/files/adobe_pack_cost.pdf
    • https://cdn.shopify.com/s/files/1/0439/9818/3582/files/41553515787.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006450.bin
c19b86c67b55d0f7a28ea76e9c3917d0cfb9ab7ba8643ff448b1773ce989ef69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6450 5080 bytes
font_01_sfnt_off000075a8.bin
1873f970517972362b3c559296baab31211de5e54cd18e59e803b7be872ee532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A8 9920 bytes
font_02_sfnt_off000097ae.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AE 4324 bytes

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