Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b88240f9f6fa0c…

MALICIOUS

PDF

93.8 KB Created: 2020-08-10 10:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30490b9ee73c34e04d265a2f0a2c94dd SHA-1: d55f03573f1ab3f89dcf2d269f9a31803d839104 SHA-256: c9b88240f9f6fa0c6625c977fc3b2f3e18f61ee37ee2da98af806f50c34a8509
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to educational materials, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to serve further malicious 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.cc/pify?keyword=ncert+solutions+for+class+12+accountancy+chapter+3+pdf
    • http://files.botezatconstruction.com/uploads/1/3/0/9/130969241/927049.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://files.weikolin.com/uploads/1/3/2/7/132710763/dobogub.pdf
    • http://files.shireendamghani.com/uploads/1/3/1/8/131872178/puzobezoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/kobaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/83473521471.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1568204463.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/pivojifuvipelofigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/porirolezozozovesadigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/35317586610.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/48883852455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3365514284.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/cancer_de_pulmao_inca.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/uses_and_misuses_of_social_media.pdf
    • https://cdn.shopify.com/s/files/1/0437/8565/0325/files/meilleur_livre_apprendre_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0434/4928/6817/files/standard_business_card_dimensions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/87389328155.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/8842062397.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e2c.bin
1d94c93d6d03878ee7721ffd48013f3a2a949ba88a9d05bea6e5e2736d5f166a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 5660 bytes
font_01_sfnt_off0001217e.bin
904d707b1ccc7aeb866cab9a046b715ef5b7a04334291d68849334bca847c463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16120 bytes
font_02_sfnt_off0001537d.bin
4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1537D 16164 bytes

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