Malicious PDF — malware analysis report

Static analysis result for SHA-256 430dd00c9203a375…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 17:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce12f72732c29005470cc6c3aa87354c SHA-1: db7721ba468a8fd9567d3de5e248dd5fe88d97c5 SHA-256: 430dd00c9203a375f01d880526fc24a01cd7d91955ba80f2e0c290d74324d598
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.ru/pify?keyword=circuit+maker+2000+tutorial+pdf`. The document body, though heavily obfuscated, contains references to the same redirector and numerous benign-looking PDF links hosted on Shopify, likely to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=circuit+maker+2000+tutorial+pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/56327299910.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/losofidafamef.pdf
    • https://cdn.shopify.com/s/files/1/0466/4963/9077/files/web_to_firefox_addon.pdf
    • https://cdn.shopify.com/s/files/1/0435/7976/8995/files/acrobat_printer_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5095/files/38145921938.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/pdf_page_splitter_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/abba_happy_new_year_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/gimp_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/coronary_angiogram_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/nj_wr30_quarterly_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/vegunadisuxupudibun.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/remove_watermark_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/peptic_ulcer_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/39342849865.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/womibenagagamaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/3042/0384/files/dovapodopakovutija.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_off000060ad.bin
9da3c805e8c0390e70593fc3ab230492396cc1e858bef8a1de7b888af09f362f
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 5368 bytes
font_01_sfnt_off000072d6.bin
feead13cba17677484f27eca3e7f8b4fdd47b84fef68fd226c66bc9c8a6b0d7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 9900 bytes