Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b26e0c2ac7c9df3…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b611e1c437274881bd1276e6625967 SHA-1: 47b2cfccca9b037bc8e092d656bd63c3ab680b74 SHA-256: 5b26e0c2ac7c9df399a0d51cae5bf57eef30cc365c8b2074ed130a43a9d89d00
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'design guide' and includes the malicious URL. This indicates an attempt to trick the user into visiting a malicious site, likely for further exploitation or phishing.

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/wix?keyword=class+d+amplifier+design+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/2696/4631/files/abduction_full_movie_free_online_no.pdf
    • https://cdn.shopify.com/s/files/1/0429/3695/9139/files/17587938634.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/pugunajatilurijelil.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/f_b_service_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/archives_of_nethys_celestial_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/21879586076.pdf
    • https://static.usrfiles.com/ugd/a382ee_eef8cc99361e48349735fc49d3144cde.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0c8a07c63bc4490848aecc2d8d2a1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c5db20b1182413285f81f951a5e9a2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f3b9c2cb1cd470db88665cd18bc7821.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_off0000602f.bin
32f986d51a3944e57ea8f0197dda12be3d03dda1294474ec2ca2607f2908f9d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 5268 bytes
font_01_sfnt_off00007202.bin
24c65c2e4bd3b9678f52e02c29a2b9e13c067cdf4c5e93496d255cd84f1585d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7202 10628 bytes