Malicious PDF — malware analysis report

Static analysis result for SHA-256 1817b082c4baf31b…

MALICIOUS

PDF

47.4 KB Created: 2020-08-13 22:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e55fe1b4e721f42ff0c6b8097a290d8 SHA-1: 9f5be7fa441c3151cdde83bc061c8ff68473da54 SHA-256: 1817b082c4baf31b72e2bb3918938b249624e32cd9589fe62503a6bd4660c112
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'printable pdf' lure. The presence of a link farm and a critical heuristic firing for a malicious redirector indicates a phishing attempt designed to lead users to 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.cc/pify?keyword=blank+july+2019+calendar+printable+pdf
    • http://files.martijoyoga.com/uploads/1/3/2/3/132303382/86466b8fc.pdf
    • http://files.ogphotography1.com/uploads/1/3/1/4/131406717/f44a76fca47.pdf
    • http://zenum.erningscebulechon.com/uploads/1/3/1/4/131482976/4a5791d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/bobcat_331_specs.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/algebra_booleana_teoremas_y_postulados.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/89083118822.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/labegivasoxemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/31741376959.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/6504731454.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/11722130280.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/tapivisobatofutokexapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31995481059.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/electron_configuration_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7287/0807/files/ak_jain_physiology_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/23559144032.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_off000079b5.bin
d2d8bb0e49792328e6aab00da501d4dd146c5c0461521fef8c7cebeb90a78c56
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 5884 bytes
font_01_sfnt_off00008dd3.bin
08421fc83e550bee00b2bd150fbf7411066f8a9383ff5ad36bccc22f4148ea3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD3 10072 bytes