Malicious PDF — malware analysis report

Static analysis result for SHA-256 390ed86afd0b76e3…

MALICIOUS

PDF

46.8 KB Created: 2020-08-26 16:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28ddab2b813b911c5c9d17b6db17c393 SHA-1: d3f0e10414759f31caf19b05d048c71819f675c3 SHA-256: 390ed86afd0b76e3b20ce447805af15d11514755d161ebb18a27b08f637442d1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is designed to lead users to malicious content. The document also features a large number of external PDF links, many pointing to benign Shopify domains, but also several to unknown domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm structure indicates a phishing or redirection attempt.

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.me/pify?keyword=kinesio+tape+for+lateral+epicondylitis
    • http://dogif.alexbaltodano.com/uploads/1/3/2/6/132696056/2cad32d.pdf
    • http://files.quapawcattlecompanystore.com/uploads/1/3/1/0/131070572/6730608.pdf
    • http://butiri.groundingclimbs.com/uploads/1/3/2/3/132302780/31e9703fccd74c.pdf
    • http://files.xoxomadds.com/uploads/1/3/0/7/130739928/5973611.pdf
    • http://files.becomingsarh.com/uploads/1/3/0/7/130739567/3400932.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/anemia_falciforme_genetica.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/chemistry_notes_for_class_12_cbse_solid_state.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/sagusepuwomaku.pdf
    • https://cdn.shopify.com/s/files/1/0435/0830/1989/files/amarasilpi_jakkana_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/lutes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/23026018564.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/95928698500.pdf
    • https://cdn.shopify.com/s/files/1/0435/9290/8963/files/15174310026.pdf
    • https://cdn.shopify.com/s/files/1/0435/8402/8833/files/50067608800.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_off00006a9f.bin
c2745684a7af570dbc60ad1f372df2684141f751e8a227ac6515a2836225ac74
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9F 5220 bytes
font_01_sfnt_off00007c7a.bin
720bacac87f2f0b081aa661cc133a893a36c1c9aa057959442fc8af07ae72beb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7A 15684 bytes