Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ffb9412e2aa4df…

MALICIOUS

PDF

39.1 KB Created: 2020-08-19 05:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eff5f1cb8f76b8a17474d9bd2a264900 SHA-1: 1ff4d30357be8afb1b7001446509cc963e67bcb4 SHA-256: 17ffb9412e2aa4df35a98aa4287ab385ad39eb995987c8d2f3724acd129aff4b
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to drive traffic to potentially harmful content. The document body, though heavily obfuscated, contains the malicious URL and references to shoe size guides, suggesting a phishing or scam lure. The presence of numerous embedded links, many pointing to Shopify, further supports the link farm heuristic.

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=aquazzura+shoes+size+guide
    • http://files.deerfieldbeachorchidsociety.org/uploads/1/3/0/8/130814976/bubavotapado_dikufivij.pdf
    • http://vopog.bearsportswear.co.uk/uploads/1/3/0/7/130776277/towafanuxuki.pdf
    • http://xaruva.max-russell.com/uploads/1/3/0/7/130775403/zegujewoxejamat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1353/6925/files/20083816442.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9783/files/bts_love_yourself_answer_l.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/50776722261.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/11879549567.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/java_design_patterns_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/4925357725.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/printable_wedding_dj_checklist_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/97416501365.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/dopogesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/virtualbox_for_chrome_os.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c22.bin
ccb8a07779a56be4e14b5e6c4473e13a7183b873a683665468fde4315b6b0d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C22 5220 bytes
font_01_sfnt_off00006ddf.bin
ac9899108766191c11a56d9c389516101f28ca3416a6a94d6ee5d9054a56393f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 10028 bytes