Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e436b8163d0fbae…

MALICIOUS

PDF

55.7 KB Created: 2020-08-19 04:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7810126896b8432f31c8dceabf49dff6 SHA-1: 9f1ca528dee3897d3de876475b089f80dca2f7bb SHA-256: 6e436b8163d0fbaeb3f4939ed609a8f08beb4c47a78a9dca1b8357a405bc0215
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to medical guidelines, likely serving as a lure. The presence of numerous external links suggests an attempt to direct users to potentially harmful content.

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.com/pify?keyword=guidelines+treatment+necrotizing+fasciitis
    • http://files.jgiccanada.com/uploads/1/3/2/8/132814977/726357.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/photolithography_semiconductor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdf
    • https://cdn.shopify.com/s/files/1/0439/0689/1931/files/12v_battery_charger_circuit_with_overcharge_protection.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/upsc_history_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/69645271918.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4567/files/3d_movies_in_tamil_dubbed_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/juwoginosapizajudoxenowo.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/gerililudiba.pdf
    • https://cdn.shopify.com/s/files/1/0450/6412/6616/files/94435422951.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/bupapomawino.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/53056715294.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/32429291635.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_off00009c22.bin
ff0ea18852dac992b6aab7cd3ea37486729aabae086e5aa6d46f0b77bea67d15
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C22 5424 bytes
font_01_sfnt_off0000ae7e.bin
1e62c30ec5c17b62b14509d6f3b255381a434b2f12fb49dca012b901e4963442
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 10312 bytes