Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d72b6c14d20b11f…

MALICIOUS

PDF

44.9 KB Created: 2020-07-20 06:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea13932fbd71725ac413eb1d9847938d SHA-1: a2fcf5f5b4a9df86cfaffb9061512707deaaae34 SHA-256: 9d72b6c14d20b11f0ca9a16d27ea138908ae77adc86aa1a0fa6b973b666dc79f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms designed to manipulate search engine results. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content for malicious purposes.

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/wb?keyword=project%20management%20network%20diagram%20pdf
    • http://files.dynamicmgt.com/uploads/1/3/0/7/130739648/bdbb83920295b.pdf
    • http://files.oceansidecove.net/uploads/1/3/1/0/131070737/ab19694cac48d.pdf
    • http://files.rkspeech.com/uploads/1/3/1/4/131438249/9075954.pdf
    • http://files.vtube-imc.com/uploads/1/3/1/3/131383953/8365f1c4d73cd9c.pdf
    • https://sunoripe23167673.files.wordpress.com/2020/07/42242172519.pdf
    • https://feruvuketo726982238.files.wordpress.com/2020/07/joxijoxowikapulota.pdf
    • https://gorajeg.files.wordpress.com/2020/06/tupiliwax.pdf
    • https://poxaxuxit.files.wordpress.com/2020/06/12145354215.pdf
    • https://wimokudijo.files.wordpress.com/2020/07/folagijazunidali.pdf
    • https://rokojozosiwi.files.wordpress.com/2020/06/zibotiv.pdf
    • https://pexejopatewu.files.wordpress.com/2020/07/69953457937.pdf
    • https://fepozanidimu.files.wordpress.com/2020/07/78915585258.pdf
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/76516559105.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/gixusazowimazodugeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/14120131933.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/turadiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9950/5311/files/rifojanipef.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/bizumikut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/60106242707.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.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_off0000717d.bin
df369891d5443dfbb7edd003a2e60f4781b364d58d7b63d42f0220e998829f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717D 5284 bytes
font_01_sfnt_off0000836f.bin
381041a50a1b8ecb3119aec9aa0a8961c5d76771592b19af79c9dae7f3ae3e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836F 10160 bytes

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