Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acf756bbd764fee…

MALICIOUS

PDF

49.0 KB Created: 2020-08-24 16:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a1f6be9a5ec2a135b69b46a0a557535 SHA-1: 9109827f80273dd5dba07e3107630fd138d526b1 SHA-256: 7acf756bbd764fee9bd9805230b9ecc0af1b69dfa799cf86978a3aaf32cdcf44
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though malformed, contains text suggesting it is an 'answer key' lure. The primary malicious link identified is https://ttraff.ru/pify?keyword=mcgraw+hill+answer+key+algebra+1, which is likely used to redirect the user to further malicious content. The presence of a link farm heuristic further supports the malicious intent.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=mcgraw+hill+answer+key+algebra+1
    • http://litebixek.garthuxdesign.com/uploads/1/3/1/0/131069934/2b789aa.pdf
    • http://files.drtangiethesexdoctor.com/uploads/1/3/1/4/131452904/xozesakofuza-rilinasirog-durinide.pdf
    • http://tezudibaw.quintessencensemble.com/uploads/1/3/1/8/131871699/0c9cf9beb80e913.pdf
    • http://files.miregion6.org/uploads/1/3/0/7/130739628/safag.pdf
    • http://files.rockywoodlandforge.com/uploads/1/3/0/7/130775393/3255747.pdf
    • https://cdn.shopify.com/s/files/1/0440/9737/2312/files/nitapulevetivipez.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/lonely_planet_cuba.pdf
    • https://cdn.shopify.com/s/files/1/0439/2520/9256/files/diagnostico_cancer_de_pulmao.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1778/files/jusivanan.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/bcg_matrix_word_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1067/files/37194524715.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/deezloader_remix_4._3._0_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/gekavulotoxijadupivijiba.pdf
    • https://cdn.shopify.com/s/files/1/0438/3883/2800/files/fine_synonym_formal.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/autumn_leaves_piano_easy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/sasusexusosomixixe.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/2000220836.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/
    • https://cdn.shopify.com/s/files/1/0438/5

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007978.bin
dffc06c03208d5c9a3e940159f628b9975797118e5daed6a44edb4482b8e8d66
pdf-font-stream PDF embedded font (sfnt) at offset 0x7978 5516 bytes
font_01_sfnt_off00008c5e.bin
7cd71890d597a43eb592ccd78694f0a6662d39bb9388ca169aa8e9b4ec809c71
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5E 13396 bytes