Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fc6bab4e985be7…

MALICIOUS

PDF

77.0 KB Created: 2020-08-30 02:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449b801426f24fd6e2ebeae07b058fb4 SHA-1: f2709e238e3ca7969f307b7925d89aa95db9f8e4 SHA-256: 03fc6bab4e985be7c6e63449794297ab876f7aadc472451a1db5ed2f88268d2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.me, which is a strong indicator of malicious intent. The document also features a large number of external PDF links, suggesting it is part of a link farm designed to distribute malicious content. The ML classifier also 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.me/wix?keyword=proyecto+ludoteca+itinerante
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3f3e3cad37c74af9a38918bbef1032de.pdf
    • https://static.usrfiles.com/ugd/40512e_8c83feac0c79467b84046f277ac0db2b.pdf
    • https://static.usrfiles.com/ugd/277b62_9c70435ada2947dfa33272686d3db5a2.pdf
    • https://cdn.shopify.com/s/files/1/0450/7769/2581/files/94069413935.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/molano.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1678/files/fugasuvilusugomuwejegamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/vobupagu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/10973171033.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/25232843348.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/ssc_stenographer_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/nonemokesama.pdf
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/kemosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/masunadadowiv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fa.bin
78c6e7066785568458cd8c24db10c52f9be68e59ca1833ac8a4be4aea95087e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 4860 bytes
font_01_sfnt_off0001038d.bin
6949a9149814fc643ed2f06630bee0cb8b413001cafd098ac3542f47eb79b568
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10524 bytes