Malicious PDF — malware analysis report

Static analysis result for SHA-256 6361ad77e09e8def…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 18:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66f88b18bd63b82c3517f14b465e8f27 SHA-1: 47cb7acd861fc739f4fc4ab5a62af0e1ca92fb95 SHA-256: 6361ad77e09e8defe765745ca5c0fe23ab4c99e601438cf4ff17bacd1ba9641f
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. This suggests a phishing or scam attempt, likely using the document as an attachment to a spearphishing email.

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=my+first+day+of+school+chalkboard+template
    • http://senuroza.schoettlerhomeimprovements.com/uploads/1/3/1/4/131482995/kozeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/filiwufogagiwolalejixez.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/tutesedirijazigupakus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/lexopabevaroxunisevepon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0943/files/application_layer_in_computer_networks.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/zaguwezotalufomukim.pdf
    • https://cdn.shopify.com/s/files/1/0437/3233/6792/files/hydrolysis_of_sugarcane_bagasse.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/23079151030.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/nivilusonozezirakilumovem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/acknowledgement_in_report_internship.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/jaserizujaweti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/muledoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/vefilevolizof.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_off000065e3.bin
9b608131abeeebefbc001881a2459daa47283efb36226969cdf35ab2768dd2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 5704 bytes
font_01_sfnt_off00007930.bin
422db3fa3d70334bb6b8a4f6f3a9c0684078a140c44b5bcab0b3d1eb723bcf17
pdf-font-stream PDF embedded font (sfnt) at offset 0x7930 10800 bytes