Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347856a4f5f7271…

MALICIOUS

PDF

57.9 KB Created: 2020-08-30 07:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f54fb37fda6a1c93230cdbb7867ba5 SHA-1: f53c77a08e4bf1ec93b916ee27b51e524fc50e72 SHA-256: 8347856a4f5f727133eb81159f617ef00da179fa7634578825486e3a75fb7240
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous benign Shopify URLs, but also includes a critical link to a known malicious redirector at `https://ttraff.com/wix?keyword=ventajas+y+desventajas+de+las+tres+erres`. This suggests the document is designed to redirect users to malicious content, likely as part of a phishing or scam campaign. The presence of embedded URLs and the ML classifier's high confidence further support this assessment.

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/wix?keyword=ventajas+y+desventajas+de+las+tres+erres
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/47573013128.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/54875426587.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/35420795986.pdf
    • https://cdn.shopify.com/s/files/1/0460/1063/0311/files/jitawapunasoxabugime.pdf
    • https://static.usrfiles.com/ugd/1f2646_4e0ce0a6c0b54d08890ce4cd75933b50.pdf
    • https://static.usrfiles.com/ugd/0f5b72_a5ef3f92c5a1446184f0ef81a899bb65.pdf
    • https://static.usrfiles.com/ugd/a382ee_4af99c74aa9c49a0b093f39297655817.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/35156390449.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/binomial_probability_distribution_examples_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/profesora_de_ingles_acusada_de_sodof.pdf
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/manorama_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/mulojadegomiwalogi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a72.bin
d7b537a1407309fde3c1d8260f60470775c4beb721235961b09f0c5c8e9d22ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A72 5024 bytes
font_01_sfnt_off00009bab.bin
500faaa1676d4b1fc4ad4ec5916973b34d59219b9bf40765452f0e410d5dd215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAB 11144 bytes
font_02_sfnt_off0000c048.bin
2a4d14f05b774ddd54e8057d8a4031a738a9d393af7d9b55052b08482d652b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 17628 bytes

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