Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9e8d91edf06b57…

MALICIOUS

PDF

40.3 KB Created: 2020-08-25 16:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8322ffd6d75271ed197b0bd1f77873b SHA-1: ee5150066c5a254c847ce4e8ee38f7298d194c5d SHA-256: 0d9e8d91edf06b57af1395dfb89537b712e2583b4772d7f7254446e33692ba43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=past+tense+vs+present+perfect+exercises+pdf, is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely as part of a phishing or content-scraping scheme.

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=past+tense+vs+present+perfect+exercises+pdf
    • http://files.alwaystrive.com/uploads/1/3/1/4/131407029/5196492.pdf
    • http://zavak.underdogdesign.co.nz/uploads/1/3/1/4/131453555/7624429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/74151745018.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/atharva_veda_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/61852771862.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/wusugubaxuzetiwag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/fekuvepumuxed.pdf
    • https://cdn.shopify.com/s/files/1/0441/3535/0424/files/lomakekoludeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/herb_patches_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/nabafuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2225/2189/files/d_d_wizard_spells_5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/online_text_editor_without_watermark.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000537f.bin
2816c9fc3a56e237ca048463b665194ebcb691ab604ce8bbd0f97da544743e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x537F 4924 bytes
font_01_sfnt_off00006447.bin
0a095ec52482103feb22849f3a6f5ff9d00b6deeb262750d14cbbc0d00589131
pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 9896 bytes
font_02_sfnt_off00008630.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x8630 4324 bytes