Malicious PDF — malware analysis report

Static analysis result for SHA-256 de06ef5122640348…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 10:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67dbe64e6c8e8087655cc961c616972 SHA-1: 6f5d948b35d1d1f4591e8fb553d7dec7d333d5ce SHA-256: de06ef51226403480dfe80f37699fe010059d883aba41b2ee0a2418a7c8bdeff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.com/pify?keyword=figurative+language+worksheets+grade+6+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to educational content and the malicious URL, suggesting a lure to download further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=figurative+language+worksheets+grade+6+pdf
    • http://files.originalsavage.ca/uploads/1/3/1/4/131406947/xibafokerexe.pdf
    • http://files.jacksonwfchu.com/uploads/1/3/1/1/131163761/c40ec6b8ed1.pdf
    • http://files.wildphlowerwellness.com/uploads/1/3/0/8/130874467/bikaxijagawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/plus_or_minus_symbol_word.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/teboradisepusejed.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/30662271982.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/28892142607.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/57259032724.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/39831790956.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/principles_of_muscle_building_program_design_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/51359741481.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/zudawibepube.pdf
    • https://cdn.shopify.com/s/files/1/0464/9261/4824/files/shiva_cartoon_song_mp4.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_off00006231.bin
73c30926c7aa0302e62bdab4f8933945b0996c4f34ddd5c74fe4465ec03210a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5628 bytes
font_01_sfnt_off00007568.bin
876a9d29949393269878d7d972c05f307eaa6f33bed38e3f370a674fd5820f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10336 bytes