Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e981938c4f7e0b…

MALICIOUS

PDF

44.7 KB Created: 2020-07-31 19:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 417317b9e43fcec5d0d9b6950eaa1839 SHA-1: 2f9b25bf3d1d0f8755a2e966c1d1ce12e905f49f SHA-256: 64e981938c4f7e0b2a06efda67a7408554d5933e7623b631ed74cf6017f38b78
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. The primary link directs to a malicious redirector, suggesting an attempt to lead the user to malicious content under the guise of providing 'avl tree java source code'. The ML classifier strongly indicated maliciousness, and the PDF structure is indicative of a link farm used for SEO poisoning or traffic redirection.

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/pify?keyword=avl+tree+java+source+code
    • http://files.gresford.org.uk/uploads/1/3/0/7/130739022/nunivu.pdf
    • http://files.solarplexusbeauty.com/uploads/1/3/1/4/131437848/186d6839a0e2f3f.pdf
    • http://files.patriciawilkins-vacca.com/uploads/1/3/2/8/132814624/zojozi.pdf
    • http://files.tritoncentralbands.com/uploads/1/3/1/4/131407148/6874de6e30f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4435/5739/files/43779119655.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/54739674717.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1932/files/maxusonesunuwifaximaji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1447/0302/files/matenowuwowela.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/fakonugupajiwadixulugon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/76331747954.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/52335114385.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/gosoduvipagoxizomuvitulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/wavorega.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5783/files/19629167888.pdf
    • https://cdn.shopify.com/s/files/1/0429/4996/8035/files/zelebojabikodexurabuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/gikipomomomufola.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_off0000636c.bin
5be7f5fcb1848b8d8d46e495ce1e0624ee99d8749357d9b95c14ceea6998ecf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636C 5060 bytes
font_01_sfnt_off000074b2.bin
2c22d3f2c3f3ba9c62fc3dbb74766248d438b5191c931fed56acb97445aba89e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B2 15164 bytes

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