Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd529a1e2305577…

MALICIOUS

PDF

46.9 KB Created: 2020-07-16 05:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95f491e8c4ad06f47ff406d73ee259a7 SHA-1: 6ad6760f576f4be2069663650c80d87c7a7c3523 SHA-256: 5fd529a1e2305577c6479c24c978faa7f5e84161f8f4336d8c16ec3718a185b9
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially harmful websites, likely for phishing or SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=proyecto%20de%20grado%20umsa%20pdf
    • http://files.fairviewlakestudios.com/uploads/1/3/1/1/131164239/17be5.pdf
    • http://files.dopekonect.net/uploads/1/3/1/4/131438538/davexabodezugi.pdf
    • http://files.artofarchitecting.com/uploads/1/3/1/4/131437143/5413051.pdf
    • http://files.bestpickeddiets.com/uploads/1/3/1/6/131606465/1a697.pdf
    • http://files.impact2020conference.com/uploads/1/3/1/1/131164011/9ddd0852d67.pdf
    • http://files.emmashoosmith.com/uploads/1/3/1/4/131411542/dowimi_najimi.pdf
    • http://files.janellecox.com/uploads/1/3/0/7/130775987/basoxozalujisod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sitekoj.files.wordpress.com/2020/06/zarukadox.pdf
    • https://penigan.files.wordpress.com/2020/06/22680515710.pdf
    • https://miwezoju.files.wordpress.com/2020/07/jiwivolutorejulisitexu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0716/4064/files/nuferotevirefolat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/8569338181.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/96982003897.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/jidezavotuzarevat.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/vesipotajewonejan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/rekujilekegirenaxorigis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/85630233975.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_off0000778b.bin
578fb8a380fa8d92330ffca5aab3f0a6713c21f6b5536ad3356db4084e6a4466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 5272 bytes
font_01_sfnt_off00008982.bin
61f11924a86fefd14354f7588adb92f794373dd0fea984d0cdda05a2498852dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8982 10904 bytes

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