Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e2a2c397200e3e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-25 11:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdddf736fbcd9285fcfcd34cb50ff55f SHA-1: 88e2ea3569d524809cdabd7b3679788141b31691 SHA-256: 48e2a2c397200e3e1f39723efc953c258280188b9641d2fb30a01ebb4968eccd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to 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/pify?keyword=cranial+nerves+anatomy+and+clinical+comments+pdf
    • http://jevimosam.orientalcollectables.com/uploads/1/3/1/3/131398140/gesiweraje-newusegewoluz-nevawe.pdf
    • http://gapef.newlifefrostburg.com/uploads/1/3/1/4/131410538/db81c7dbd57e1.pdf
    • http://files.achcew.org/uploads/1/3/1/4/131482916/f91d0b35f2c.pdf
    • http://files.mcgiverncarpentryservices.com/uploads/1/3/1/4/131406337/zijixonev.pdf
    • http://dajug.stjosephsglenealy.com/uploads/1/3/2/6/132695643/jatesinerogad-fasixejejo-petivoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/14976050145.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/selilupawojebavawasifixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8366/9412/files/gujezunawujoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/37908950304.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/ccna_data_center_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/29032512031.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/54012413497.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/xuwunotamiragorunukujibun.pdf
    • https://cdn.shopify.com/s/files/1/0432/7256/8996/files/fevagigoxititusiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/regamogusobun.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/xafixogarotirufilaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/zureluzimuwopokajogari.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071d4.bin
50ed3dce138f5c2cf6179587e13a50e47db57f5159f09e41c4ca2be836d3c705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D4 5368 bytes
font_01_sfnt_off0000840a.bin
6f0317ffb9546b81be528eec454fbeb220621f02f4e0d058190b00b035f60f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 9772 bytes

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