Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebb3293baa1368f…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 08:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cebe8a45c54cd0bd228b6d9deb88b2f6 SHA-1: 63db447e7bbf177c2bcbdf1f1f8b0fcfbb31e619 SHA-256: 9ebb3293baa1368fa922bf53ab5b5dc98cd84ac498c3b68e7c810a6a510145f4
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'afoqt study guide 2015', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links further indicates a link farm designed to obscure the ultimate destination.

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/wix?keyword=afoqt+study+guide+2015
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/jaundice_phototherapy_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/8168/7459/files/calcium_hydroxyapatite_crystal_formation.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/jogo_de_dama_online_gratis.pdf
    • https://static.usrfiles.com/ugd/b8c837_09019ddf907f4121ab5fd2c0154ea5a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_48678c07c83842769f636ebcdd7e76a4.pdf
    • https://static.usrfiles.com/ugd/af0aa9_680d4121a413499094c9cc0acdb6fedc.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cd2368c0c364fc0b2f561985575212e.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/12144276205.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/camera_fv_5_lite_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61927850068.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ed75cfebe6046b6a65ea0b82b94befb.pdf
    • https://static.usrfiles.com/ugd/0bcf16_4de8559c9b9d4caab521340dbe9b5161.pdf
    • https://static.usrfiles.com/ugd/6f58fb_0fc9459034af44dba5b3f9a5b66485ef.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_off000061fd.bin
540752d1e5919a50a8dfe218e50826c98b45582c89399493810edc8aeb2bdc63
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 5404 bytes
font_01_sfnt_off0000748a.bin
a7da85c3cfa6ac49c60f8948b4d056b1441502026967619a702af255377d8bd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x748A 11244 bytes