Malicious PDF — malware analysis report

Static analysis result for SHA-256 713af2791e3dc51b…

MALICIOUS

PDF

45.6 KB Created: 2020-09-01 01:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85bb1e067642d35d5d7add5596b1c129 SHA-1: 5d7e317183472273f429dc9929827b438f45b049 SHA-256: 713af2791e3dc51bc5314cb4c0835a460865a82fb41856b922c62d7d22c46ee4
162 Risk Score

Malware Insights

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

The PDF contains a lure for a 'form template' and embeds a link to a known malicious redirector. The ML classifier strongly indicates maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

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=handing+over+taking+over+form+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9eb187_eab2677d2ae24e52aa16cab0ef21b8e3.pdf
    • https://static.usrfiles.com/ugd/e78b77_8c0e96460a7746659e8bd2539ec7c011.pdf
    • https://static.usrfiles.com/ugd/a76634_d83675da23ef4fc5a8be03421819c18d.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/clasificacion_de_los_huesos.pdf
    • https://static.usrfiles.com/ugd/7603ae_05d22745b8164df6861559c009ea0021.pdf
    • https://static.usrfiles.com/ugd/b8c837_59d9d69230334a6b8ca06d00fe49907e.pdf
    • https://static.usrfiles.com/ugd/48f461_adef9dbbb72e452db9e116c394bef2c2.pdf
    • https://static.usrfiles.com/ugd/ef253e_e71fffdc6d8245f1b4e12ef4d0ee6db4.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/lonosugabilurisebobuwola.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/34343469399.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/83273590691.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_off00007462.bin
8843a368ab3e74ea48941375f72a7d4d828143369d1afcf24e996ce5fe551c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 5268 bytes
font_01_sfnt_off00008647.bin
82415a59cee93ed0dc0a515bbf927007985d11f98a76be76a54c83e6c158bd86
pdf-font-stream PDF embedded font (sfnt) at offset 0x8647 10504 bytes