Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b852cd2dc395f6f…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 03:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb98d7cdaf4c852b7d88c2bdc6c47858 SHA-1: 7417f94daf3d8b98434c4ebcb17d308ac6c5f80b SHA-256: 3b852cd2dc395f6fb11fc8f5e24424fd5a36667cfceaf9c9a596bc4631d3691c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many pointing to Shopify-hosted PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=elasticsearch+create+new+index+with+template'. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a redirector suggests an attempt to distribute malicious content or manipulate search results.

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=elasticsearch+create+new+index+with+template
    • http://files.upatuga.org/uploads/1/3/1/0/131069863/0026aacd34794.pdf
    • http://files.lorettacrogersnovels.com/uploads/1/3/2/7/132711970/bezufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/bomezapik.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/mamujerefudokibetejikad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/barred_tee_specification.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxepetumikikexozifaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/ashrae_fundamentals_handbook_1997_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5149/files/bncc_lingua_inglesa_ensino_fundamental.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/94627493656.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/junipodomomaluri.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/jafudon.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/representation_letter.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/pathophysiology_of_congenital_hypothyroidism.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/gijodepoparaliniza.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/besitomebil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a3.bin
319fba5fc6d5cf06cbc69940f4184507e8348b8e944356e8c13792a581950b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 5108 bytes
font_01_sfnt_off000071da.bin
aa3d5c5382f3198dd0d07109ec1a640df7b0063565072c1f571ebb3ba920ae08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DA 11864 bytes
font_02_sfnt_off00009864.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9864 4324 bytes

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