Malicious PDF — malware analysis report

Static analysis result for SHA-256 023347ff890a4ebf…

MALICIOUS

PDF

40.3 KB Created: 2020-07-30 22:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd5c1c8665b3d8e1603f928e51c84eb SHA-1: fc06dd1f38426365ab5e3b4fe0089f9529e192cf SHA-256: 023347ff890a4ebfd361b7828fb151845772236374503d4068cefde5d3b13f93
162 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, pointing to suspicious external URLs. The presence of a download button lure suggests an attempt to trick the user into interacting with these links. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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.com/pify?keyword=simple+present+tense+pdf+exercises
    • http://files.inniscarraparish.com/uploads/1/3/1/0/131071240/zetufur.pdf
    • http://files.sawdustsistersbirdhouses.com/uploads/1/3/2/7/132710780/fulagosaxevi-fogiwurirako.pdf
    • http://files.hwcroquetclub.com/uploads/1/3/1/4/131453588/pukon_budejopafo_xodozogudu.pdf
    • http://files.eagleglobal.org/uploads/1/3/0/9/130969545/1a1569794a1fc7c.pdf
    • http://files.antonthomasart.com/uploads/1/3/0/8/130814861/5938178.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/fitubavofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/fuzumanow.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/55321097120.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/31164518370.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/41405997278.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/rerezarevulelavejurapoje.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/lowekidobagoginufilola.pdf
    • https://cdn.shopify.com/s/files/1/0432/8659/3694/files/1187355782.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/gupinijakajujemujoguzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/77739011283.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/36008772891.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.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_off00005fdb.bin
dd2487c909e169cc0c1fe394033a526c5f67d52f047753db58b02e3c9e1e09f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 4940 bytes
font_01_sfnt_off0000708a.bin
e99d2635f55dec61cc1b14631e08628ccbb90377e44855576bf3f3bef3cb15c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708A 10628 bytes

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