Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9946988e0b08098…

MALICIOUS

PDF

49.5 KB Created: 2020-08-09 18:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08027ba72e1cbb2c696021e7b0348cd4 SHA-1: 9a4ce4a37ca9fa5427ff2c7f41adab25a936e86e SHA-256: d9946988e0b08098a26b8c48adce0dfd4cceb5e93a1a45a3c2621f6a855012be
152 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing pages.

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=alimentation+saine+%25C3%25A9quilibr%25C3%25A9e+pdf
    • http://files.christinemottram.com/uploads/1/3/2/6/132681824/5f3c26ff383.pdf
    • http://perage.ihmphotography.co.uk/uploads/1/3/0/8/130814423/987580.pdf
    • http://files.klbookexchange.com/uploads/1/3/1/1/131163932/5e4e293bdd9.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1160/files/drastic_ds_emulator_apk_no_license.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/anderson_pediatric_cardiology.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/r_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/putugikokoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/nedamubelabibejovomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/sogenilusajupijasorezajek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/10452507035.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/rewuzubakokaguvuteno.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/wosuziwojobifugamez.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/98310423854.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/740222792.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/52174396156.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/60003130952.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/sadivajuwes.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_off00007e50.bin
fdc8fbdad2df27c74de59c355695e060b56fb025c64c2616f849f56d218a78c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E50 5584 bytes
font_01_sfnt_off000090e0.bin
fbf4a7cd719dd328020e7f5586d2ca6026687bbf3fdccc4f02f80eaa71f5a5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x90E0 12176 bytes