Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b04a52f76ac1c58…

MALICIOUS

PDF

73.6 KB Created: 2020-08-07 09:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b089c7a3d2ecbacb021090085fa3d09 SHA-1: 82c26a334e49c0da72a1738f2222b550b96d0bfe SHA-256: 7b04a52f76ac1c582d2ef1224469985b57ffca8badf836c263586c3f6d4c520a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier strongly indicated maliciousness, and the link farm heuristic confirms the suspicious nature of the embedded URLs. The document body itself contains obfuscated text and a URL that appears to be part of the link farm.

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/pify?keyword=adenoma+tubulovelloso+con+displasia+de+bajo+grado+pdf
    • http://files.montacutemuseum.co.uk/uploads/1/3/1/6/131606360/lotapuzovaduj.pdf
    • http://files.onyxfuneralplanning.com/uploads/1/3/1/3/131380413/pofadajigivep.pdf
    • http://jedolane.ashtenfarahphotography.com/uploads/1/3/1/4/131406390/susevowuzib_noleno.pdf
    • http://files.mollylizzio.com/uploads/1/3/2/6/132695394/9758950.pdf
    • http://files.constructionprogress.org/uploads/1/3/0/8/130874266/pumulogupopaxem_wifibajedowur_pulozakiwokupa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/shani_ashtottara_shatanamavali_in_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/tagipamiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/60212965558.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30549310566.pdf
    • https://cdn.shopify.com/s/files/1/0438/1841/8333/files/balance_sheet_equation.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/14789195397.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5277/files/hide_scrollbar_css.pdf
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/atomic_habits_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/school_dance_rangers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/59261868297.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/sixodibizuwotudodepuvided.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_off0000d0d2.bin
5fb8c331aa88e8f0b558a9ea99f2bee6eccddb006e2815c6a7dd51e83f6b7268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 5740 bytes
font_01_sfnt_off0000e449.bin
6e6a2d42ffcc52cfed705e3871310cdb4e4e96aa612f21ec7ff71b3b4c6149dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16872 bytes

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