Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d4849cb1815f54…

MALICIOUS

PDF

42.1 KB Created: 2020-08-05 06:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c84b00cbc2cb5badb0fd93679fd2565 SHA-1: 78a3e3956c412f131678d4bb3d4cd6519540ed2a SHA-256: b3d4849cb1815f54b52ca4f3b741de4694d0d4833050243e1cc9774a3c905e74
152 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as legitimate software downloads, specifically targeting "Adobe PDF reader download for Windows 8.1". The primary malicious URL identified is https://ttraff.ru/pify, which is a known redirector. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting malicious sites. The ML classifier also strongly indicated 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=adobe+pdf+reader+download+for+windows+8.+1
    • http://files.cheerycards.com/uploads/1/3/1/6/131637016/walijitogivo_limije.pdf
    • http://files.eloquentlearning.com/uploads/1/3/0/7/130775848/cc6dec7b91ea.pdf
    • http://files.180degreefinancialcoaching.com/uploads/1/3/1/4/131407424/wivonutolivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/rozevavinemuvelonagipe.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/haynes_manual_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/luxisokigegetalajuragi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/mozubulotegu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2803/files/33883184533.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/81758366144.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/fadipubafojunenopavipotiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/xilobux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/sojiropavuvadatin.pdf
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/29767067422.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/41962730344.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/12396032147.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/begedijanigusifixasag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/99140346384.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/35918242212.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_off0000647b.bin
6af5e01224e255d1f772bb2bfa7574009aff30b54f105f74089e39fa68e8d3be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5536 bytes
font_01_sfnt_off0000776d.bin
b6cf311563f8c8294c5de1f112869f232a65837a39c696defca4cf7406f7c901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776D 10420 bytes

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