Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4e257c5e7e2363…

MALICIOUS

PDF

40.9 KB Created: 2020-08-26 05:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1adfcebc19757c48e67726d010e3a0b5 SHA-1: e2703cfff689f73451dcbed2468aecbb730e9d50 SHA-256: 9d4e257c5e7e2363ff45aae3e4a22f25bf261649e9e8b75e790f0ac625deaf1d
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning model and contains a large number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body contains garbled text and what appears to be a reconstructed URL, suggesting it is not intended for human consumption but rather for automated link distribution or 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.com/pify?keyword=nginx+%252A2+%25C3%25ADndice+de+diret%25C3%25B3rio+de+est%25C3%25A1
    • http://bivisibap.dobiedomain.com/uploads/1/3/1/6/131606289/luxowulusulud.pdf
    • http://files.ctpartyrental.com/uploads/1/3/0/7/130739128/zurabaratod-gobutarowikuzog-ruxosak.pdf
    • http://tubikete.glanbrookcadora.ca/uploads/1/3/2/6/132695213/22cb99.pdf
    • http://files.wseast1984.com/uploads/1/3/0/9/130969334/28052.pdf
    • http://files.mainstreetblytheville.com/uploads/1/3/2/7/132740586/469772.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/97824968798.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/os_argonautas_do_pacfico_ocidental_coleo_os_pensadores.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/89358178442.pdf
    • https://cdn.shopify.com/s/files/1/0431/9100/9442/files/liditisefatuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/81276249094.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/mmorpg_the_almighty_ring.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/25729248395.pdf
    • https://cdn.shopify.com/s/files/1/0434/1779/6770/files/java_code_for_tic_tac_toe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/mokavomijoputavofijekelu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/las_instituciones_voraces.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/52221369140.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_off00005c6a.bin
fbeb914c155668cdcf13981f6f663c0ab9492cac960f31fda5e9fee7536940cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6A 5524 bytes
font_01_sfnt_off00006f0b.bin
0f6aae5fa330b60ac95670d49d6760cedb1cc11694aa3cac46688748cfa41697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0B 12108 bytes

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