Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b52650fb9d49e8…

MALICIOUS

PDF

42.5 KB Created: 2020-08-21 17:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbec5cc84c450c886caf1e534bb211f5 SHA-1: c0fc1556083a16087350a51d425972d9d80166dc SHA-256: c7b52650fb9d49e8c5ee60039448e607bfc7417fdd1feebdf7be7dbb49f8e882
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file contains a significant number of embedded links, many pointing to Shopify domains hosting other PDF files, indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which likely serves as the initial stage for distributing further malicious content or leading users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=graphing+trig+function+transformations+worksheet
    • http://files.kaymadeit.com/uploads/1/3/2/8/132814518/lesekog_rusopop_pilatu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/mufojadufoxufagiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/33539289231.pdf
    • https://cdn.shopify.com/s/files/1/0427/9966/1223/files/morulemajogefesutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/13916298108.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4665/files/l_arboriculture_fruitire.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/34930297146.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/91943949672.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/29129847611.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/zearn_student_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/viruzi.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_off00005e1d.bin
e7d2d5879e5741a049d6a7bcd02602296f02ce5d39667f46b24028fc3264124e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1D 5584 bytes
font_01_sfnt_off0000710a.bin
db048fae63f3543c5c6c1c853811b9ed17d9cb064a11075689291236000bb805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710A 14312 bytes

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