Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6a2c8ef09e9d7d…

MALICIOUS

PDF

50.7 KB Created: 2020-08-08 15:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f6089312d37040667d96a8220afb68b SHA-1: 11ba1b423b41710738ebaff840bc1923165a897a SHA-256: 0c6a2c8ef09e9d7debaac44be7f18f1f624187768071d48379b63fbb8d992711
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious or unknown domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The presence of numerous PDF links, including one pointing to a malicious redirector, indicates an attempt to drive traffic to malicious sites.

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/wb?keyword=ultrasound%20musculoskeletal%20system%20pdf
    • http://zikitunok.risingnorthproperties.com/uploads/1/3/1/4/131437657/9a7788d0.pdf
    • http://jirir.campingasseiceira.com/uploads/1/3/2/3/132303035/nigajosol_guvobuf_korogawuwiv.pdf
    • http://winagaguv.champagnedargent.net/uploads/1/3/1/4/131406390/3f50dd94e2a33.pdf
    • http://pufukutam.alfonso-oliva.com/uploads/1/3/1/6/131607163/watanomuw_pefibinapidamo.pdf
    • http://files.mazarchery.com/uploads/1/3/2/6/132682134/9294203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/meaning_of_social_science_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9429/files/1788323231.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6384/files/papirawotewelezuzosukil.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1853/files/tabela_de_aliquota_de_icms_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/2541/6860/files/declutter_challenge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/biotina_galena.pdf
    • https://cdn.shopify.com/s/files/1/0437/2906/0001/files/vatevipofuzedotiseki.pdf
    • https://cdn.shopify.com/s/files/1/0436/0821/1619/files/jedoxelepuponusogavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/47329645321.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_off000088d1.bin
bd5007238cb54597aa44c0e07f9c7d57dca1bc62acbbc4de6f4515ae2c55ef4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D1 5456 bytes
font_01_sfnt_off00009b58.bin
ad99a0b2317f68e38a1da1827134700219177b6ca3c04d25b9f62186e90ed03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B58 10176 bytes

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