Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0e51eca39dbe22…

MALICIOUS

PDF

39.0 KB Created: 2020-08-08 01:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21a925dd34b011f7a759856feff1d29a SHA-1: 4f9237eeced1b48c71a4ee8e67c14c47708523b8 SHA-256: cb0e51eca39dbe222c68ecac62c92ef40bce0ab1e99e48a662db84ff33e0e6b9
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly indicated maliciousness.

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=cristianismo+puro+e+simples+pdf+minhateca
    • http://winet.bbhhspso.com/uploads/1/3/0/8/130874284/ditenojim-lipopedabaxa.pdf
    • http://files.gocadets.com/uploads/1/3/1/4/131483391/fiboru_juvarifafavu_kawogozi_nofaxu.pdf
    • http://files.hoopconvention.at/uploads/1/3/1/3/131383480/ccc89eedb1a.pdf
    • http://files.vanderlegal.com/uploads/1/3/2/6/132681971/bexujaseturapovilat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/lunowalixetu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8908/2006/files/body_parts_name_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/90640579688.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7238/files/78765941418.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/banking_operation_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/varera.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/44445058602.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/17457666738.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5882/files/70509744059.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/17602801687.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/bsa_cooking_merit_badge.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/59325046624.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_off00005874.bin
77106414352ef53ae748e1cfc7177ae77498aa5e7d48c9f8bb479bee8be6592d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5874 5300 bytes
font_01_sfnt_off00006a4a.bin
767e1b61c2c3065aaf91b6eadc70f95865b819a16e8e2a4678793dbfa1da0974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4A 10780 bytes

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