Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea728f90bea2eb8c…

MALICIOUS

PDF

52.8 KB Created: 2020-08-30 11:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3d8fdf7164110f589ce903328d2066 SHA-1: d2abec3f8e4492402b420b67edfe3b1cc01863f6 SHA-256: ea728f90bea2eb8cba8c804af183f5cc9d1477239a156bb37d6d4177dd6b5598
154 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'psychology 8th edition hockenbury access code' and embeds a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=psychology+8th+edition+hockenbury+access+code'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely for SEO manipulation or to distribute further content. The ML classifier 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.cc/wix?keyword=psychology+8th+edition+hockenbury+access+code
    • https://static.usrfiles.com/ugd/9c43ec_b5256cf34c9944d79e307511cd9c67c1.pdf
    • https://static.usrfiles.com/ugd/191a6d_07c2eb820bfa428c8f1a79404969203b.pdf
    • https://static.usrfiles.com/ugd/599026_28c8f3822fdc427baaad7c3d2a322e69.pdf
    • https://static.usrfiles.com/ugd/5899d5_68953a4de6a846fe8c7764bb03e5aec5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be3f9a172cd4177b11731fd3b77c14b.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1510/files/ninovolad.pdf
    • https://cdn.shopify.com/s/files/1/0463/2379/4077/files/site_para_baixar_jogos_modificados_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/88090447501.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/zofebebufigopobofuluk.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ef0b7b5cfa94282a8fa342ea28f6974.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c32697e40e47429aa316643a28fa53.pdf
    • https://static.usrfiles.com/ugd/b8c837_7dd8aa1f5fb74c2fb303887fcf4ac9e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a96d25c4cc5c480582757f9d36e12178.pdf
    • https://static.usrfiles.com/ugd/b8c837_35f58c7f1bdb4e2b92f86599e2795825.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ee06d60f0284a798a6b926a51b6b185.pdf
    • https://static.usrfiles.com/ugd/7f46b5_8e5579e4fa4b4aca930e61e9db8d8f1f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083fd.bin
146acac7d270669f867b3af4320ee7285d8a1ccc4ebe378902c30b8aacc724aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 5584 bytes
font_01_sfnt_off000096df.bin
24e69684667bc1373ecba3b6f37334e87f9ac5780cdf1413ffda022e2e7c7f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DF 9668 bytes
font_02_sfnt_off0000b7ef.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 4324 bytes

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