Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e5bbc67da405bb…

MALICIOUS

PDF

47.7 KB Created: 2020-08-23 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bd1662e4a526f4e421a681a6642041a SHA-1: 094b59ea0ac218ed46300dac43b47b20cc104e62 SHA-256: 15e5bbc67da405bb7a2ed26fcbb995c9d1d8f2e9a23d1e5a0765a6038616b6f1
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The presence of a 'download button' lure suggests an attempt to trick the user into navigating to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=thrilling+adventure+hour
    • http://files.nouraspencils.com/uploads/1/3/2/6/132695511/ed5f91a030af6.pdf
    • http://files.hairandbeautybyrochglow.com/uploads/1/3/1/3/131383802/6445132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/fuzzy_mathematical_programming.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0775/files/45056455068.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/legend_of_the_red_dragon_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/hiwin_ballscrew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/79860801226.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/82637931145.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/baxexubiporugoja.pdf
    • https://cdn.shopify.com/s/files/1/0438/8696/8987/files/net_framework_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1901/7124/files/tafebo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/ba_1st_year_maths_book.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_off00007dab.bin
0aa845cad6a935ebf59cc50e64706a55065febc35a515199a837b551d67b1aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAB 4916 bytes
font_01_sfnt_off00008e60.bin
6bd9dd8f5a948628ed156ec7e5fe33e50e5dc4667634d7aace7170d5c08bda44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E60 10468 bytes

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