Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cd2da713d2e516…

MALICIOUS

PDF

41.5 KB Created: 2020-08-18 21:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55d6e53c898d688ef002c15786e03cf6 SHA-1: f09cda322aa22202dd8f9def47e19e7bea5b017b SHA-256: 13cd2da713d2e516728bea9ba02cd85dbf20526f0a26bb90f9ada630125a8ff0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to a redirector service (ttraff.com) and a large number of other PDFs, suggesting an SEO link farm or traffic generation scheme. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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/pify?keyword=anthills+of+the+savannah+summary+pdf
    • http://bitor.mlkccnc.org/uploads/1/3/1/6/131606490/6966688.pdf
    • http://files.chrislilly.tv/uploads/1/3/0/7/130776728/nufopufiso.pdf
    • http://files.oslutheran.com/uploads/1/3/0/7/130775320/3263192.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/30360711834.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/23025698080.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/botanical_names_of_flowers_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/330246104.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/juxajufimeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4986/files/92829072418.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/vimar.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/realistic_minecraft_resource_packs.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/duxusas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/roxebajiwapabamaranufej.pdf
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/office_365_equivalent_to_google_forms.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/texufitarulojixeve.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_off00006548.bin
260e2c12dbf60d8a08fa86c654b1786e1cbad2219e8a69c4f7a02351c4dd6fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6548 5432 bytes
font_01_sfnt_off0000779e.bin
a01aa5baaaecc5c83e7c1103a1c56302842214873730c666cde04aeeaed193ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x779E 9876 bytes