Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f50bad0f1256530…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 08:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b6b25373dd701fa6095f62efe88c442 SHA-1: aba38efbb3505d150135029e1054722a7f690c73 SHA-256: 7f50bad0f12565306cb428fa4ad8fcd74904908a8b35e94f4c127325ad9072d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO link farming or to obscure malicious destinations. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=death+of+a+salesman+summary+act+1+pdf
    • http://risemox.roundmountaincreamery.com/uploads/1/3/2/6/132681556/rufavatapeko.pdf
    • http://files.the-last-word.org/uploads/1/3/1/6/131606756/365115.pdf
    • http://xazoriti.gateways2peace.com/uploads/1/3/0/9/130969352/3650250.pdf
    • http://files.weirdobooks.com/uploads/1/3/1/0/131070842/gakaz-verumexebuwas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/moxakefosokazuzaxoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/aha_2020_acls_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/notilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/terminal_commands_mac_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/kenapage.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3432/files/gejuxijaxuwutewovaxinav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/burhan_nurgiyantoro_teori_pengkajian_fiksi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/96720182076.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/jefapevizafowejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7430/files/apostila_caelum_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/begowazexegupesizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6776/0028/files/atwood_machine_problems_and_solutions.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_off0000718b.bin
35194477f3cb43ca627ab1586f45e7f7aecf15e9d9850d24a07e3bd792cec8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 5548 bytes
font_01_sfnt_off00008455.bin
2c3dbeca254de0437f69d70c3a9ffe78950ae6948fd22006ab9495e4d4bcbb3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8455 9240 bytes

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