Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa5f3785a575da7…

MALICIOUS

PDF

47.6 KB Created: 2020-08-12 04:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f84fc9eb4466df4372fe1df02b56cf4a SHA-1: 70b7d0dea4a56a61b2ed244480361acd7a46be4c SHA-256: eaa5f3785a575da7fc1adb28a8a9c449e9ff21db147f848b12d6463e30571fc6
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=amazing+grace+canadian+brass+trumpet+pdf'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the PDF exhibits characteristics of an SEO link farm, with numerous links to external PDFs, including 'https://cdn.shopify.com/s/files/1/0434/1016/1829/files/34640595824.pdf'. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=amazing+grace+canadian+brass+trumpet+pdf
    • http://files.crunchychristianmama.com/uploads/1/3/1/1/131164358/xowusixizoka_lasugojixukedad_difasezojit_jipavubo.pdf
    • http://roxezo.completecritter.com/uploads/1/3/1/3/131379730/pevatoxer.pdf
    • http://vebeku.fountainoflifeministrieshavelock.org/uploads/1/3/1/8/131871699/juxakiterakewo_mizebilob.pdf
    • http://nakewaf.rahbuilding.co.uk/uploads/1/3/0/7/130740178/wavadigo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1016/1829/files/34640595824.pdf
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/agritourism_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/wedebowuna.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/carbohydrate_metabolic_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/discord_how_to_quote.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/nutaxumejewozuvisiledero.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/input_validation_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xozujegemuzudileruzodedus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/xvive_u2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/wka_rule_book.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_off000070f4.bin
0ed62d48c0045b7f4a73146432533c973f7287a24e10017c9d8abaf6df1f97b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 5620 bytes
font_01_sfnt_off000083ec.bin
18266e4b20b046f0d2a2f635eba5e48457f1d451fadc32597a91cff37a077ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x83EC 14276 bytes