Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dba58f0cc67878…

MALICIOUS

PDF

53.0 KB Created: 2020-08-07 02:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d11d07540b0c714dc93f236e249de63 SHA-1: ccbe9d967e6f85ea340ef4dc2d343ac27fa01c3f SHA-256: 70dba58f0cc6787829fed3aa8146b0ba85b3e71c3de3a28316ac77aac285ed85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure users to malicious content under the guise of educational material. 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/pify?keyword=bar+chart+questions+ks3+pdf
    • http://files.lasalleyouth.ca/uploads/1/3/1/1/131164112/a6f2394.pdf
    • http://josineko.tiffanymckenzie.com/uploads/1/3/0/8/130813042/wukele.pdf
    • http://files.wichitajoyorganics.com/uploads/1/3/1/4/131437864/kenuwaxiwitetozole.pdf
    • http://sudagub.wildflowerartist.com/uploads/1/3/1/4/131407558/8993276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8170/2301/files/88182767009.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/nevodomiruwitajuwasuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/aprendizajes_clave_cuarto_grado_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/zokizowapototu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/nomuvaleditalulabev.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/simon_ielts_writing_task_1_academic.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/11135749716.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/gedaxuronepakuduxunimip.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/27061471670.pdf
    • https://cdn.shopify.com/s/files/1/0434/2464/5272/files/ipl_2020_schedule_full_match.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_off00008751.bin
ceb783bd70d54eaa288f4e7a157ff0d2dc5b983cefd38ec3b7a748787163bf7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 5612 bytes
font_01_sfnt_off00009a62.bin
cc67cd2e5ca225461c9cebd78c8822db4daaae6ab9df5e04d06f2d602085cd8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A62 14320 bytes