Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea96b9fab6917d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-22 14:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09eef95b855aa6d71a1844eb4e2779ef SHA-1: 7b12eae945b23d7b2f41cddbe5ae47e80f29b3e5 SHA-256: b4ea96b9fab6917d3f1d5674b31070bbd442eadb62eebdf3e0023f8d05ffea5b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links to other PDF files, indicating a link farm or redirection strategy. One of the primary links, 'https://ttraff.cc/pify?keyword=capitulo+7a+realidades+2+answers', points to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=capitulo+7a+realidades+2+answers
    • http://files.colburnart.ca/uploads/1/3/2/6/132695416/7647794d5762.pdf
    • http://files.georgevecsey.com/uploads/1/3/1/0/131071043/xibelipubur.pdf
    • http://files.icarerx.com/uploads/1/3/0/7/130740571/7314968.pdf
    • http://feviva.isabellabolster.com/uploads/1/3/1/4/131438640/4a6297a7.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/30565050945.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/57791400610.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/29819536970.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6944/files/11288090363.pdf
    • https://cdn.shopify.com/s/files/1/0437/6569/4613/files/vapug.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/pdf_akuntansi_syariah.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/dedavapejivizav.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/sister_location_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/deruzevarasewokegesiriw.pdf
    • https://cdn.shopify.com/s/files/1/0458/6438/6713/files/basalonawovudiwirorobun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/wopisusodabikilapusener.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/2633910154.pdf
    • https://cdn.shopify.com/s/files/1/0445/6303/8367/files/suwumapadukinonuzade.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/graphic_design_leaflet_templates.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_off00006288.bin
e93be8772fe7f7f47d4bd2e3ab4bb4ccc5da9f72bb99e504786a81efa973a75d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6288 5164 bytes
font_01_sfnt_off0000743f.bin
e0accadb7de287539c1e3a9d56332a7e8e5244394176ed7cf077669fc1f6cf4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743F 10468 bytes

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