Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2084bce88a3c1f…

MALICIOUS

PDF

48.3 KB Created: 2020-08-30 01:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da1ef1b791394470f182cb5e51e11efb SHA-1: d5444c8cab23ceb4a2505bd928974d37bfe10b80 SHA-256: 4d2084bce88a3c1f96193fdefddf1c630f3f6effd6c8f4f9c81f9dde339465a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=day+and+night+kid+cudi'. Additionally, it exhibits a PDF link farm with 30 external PDF links, predominantly hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL and the link farm strongly suggest a malicious intent, likely related to SEO manipulation or redirecting users to harmful content.

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.cc/wix?keyword=day+and+night+kid+cudi
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/charter_outage_report_number.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/agnisakshi_serial_yesterday_episode_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/69049960360.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3469/files/natixujivurufukovekatore.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/90542813668.pdf
    • https://static.usrfiles.com/ugd/b8c837_70daa1f1fdf1455cbc981c6cfc1217fe.pdf
    • https://static.usrfiles.com/ugd/7f16bd_a772eaafc941473ab614009787b452bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_642773ac15ce4b6585d5d3bfa5f34a20.pdf
    • https://static.usrfiles.com/ugd/105a8c_0000d632eae04231a3f77f9d9e7df69d.pdf
    • https://static.usrfiles.com/ugd/003b86_ef119088295846d5861682f7900983bc.pdf
    • https://static.usrfiles.com/ugd/913720_2438dd41de424c3d8078dad0c071cbf7.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/70925108467.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/nursing_care_plan_for_postpartum_hemorrhage.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/aptitude_exam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/94602240586.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d73.bin
6c060565c4a9320fbb59ceb83fd97fabb52089127de7ae8c8032312ab247d2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D73 5060 bytes
font_01_sfnt_off00008eac.bin
8c0fa6056bc7e3e738415a667185c9bc85d20aeecb9e8f3b6b37c249d3cd0bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 10948 bytes

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