Malicious PDF — malware analysis report

Static analysis result for SHA-256 05de1ae3c666ec68…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 16:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca261bee9cae5a866f383df3e91e43f5 SHA-1: 651148e474ba3cbc70c552cc0b39eada3f2311a3 SHA-256: 05de1ae3c666ec68e0f95f1b443e89c5ba6591a849e71a1d19010895af11fed2
154 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=pares+disfuncionales+biomagnetismo+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site.

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=pares+disfuncionales+biomagnetismo+pdf
    • http://rulozinu.davidstabler.net/uploads/1/3/0/9/130969426/30bcd93.pdf
    • http://files.thegoldilockstrilogy.com/uploads/1/3/1/4/131437091/nadipedudekeridubub.pdf
    • http://files.communitycommitment.net/uploads/1/3/1/3/131380944/mezusew.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/41558784789.pdf
    • https://cdn.shopify.com/s/files/1/0438/5118/6336/files/zosutomemidevagufebelip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/bibelen_p_dansk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/56550039469.pdf
    • https://cdn.shopify.com/s/files/1/0449/6778/8712/files/autocad_plot_transparency.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/4334738104.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/zimazuvovepekajuneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5634/0890/files/wiwizekipixoverike.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufuma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73875000904.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/rusufiwanefuganileravixit.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_off000065e3.bin
d2b36345ce7bd5f51b00e66c1354d0dd54fdbf122ebca87d3f1d1fde56917c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 5616 bytes
font_01_sfnt_off000078e6.bin
5d8062a17b9b05907f6fe43b5c9f03c7be181d91e9f539429050ca273e13e1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E6 10580 bytes

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