Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea9b9710294d1c2…

MALICIOUS

PDF

42.3 KB Created: 2020-07-08 22:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd325f0b2b459508849712bb9706c23d SHA-1: 9197e8b52a2242d99bc6791413500f611f3a9239 SHA-256: 5ea9b9710294d1c27a55e76d6d5b8d0dfc94275629c7cb93a807639c57a5ca29
154 Risk Score

Malware Insights

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

The PDF contains embedded links disguised as a manual, which are designed to redirect users to malicious infrastructure. The heuristic firings indicate the presence of a malicious redirector and a link farm, suggesting a phishing or scam attempt. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=dukane%20ultrasonic%20welder%20manual
    • http://files.aikenpsr.com/uploads/1/3/0/9/130969572/efb305df.pdf
    • http://files.tenayaspeaks.com/uploads/1/3/1/6/131607239/5740736.pdf
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdf
    • http://files.jroseweddings.com/uploads/1/3/1/6/131606335/f4630d.pdf
    • http://files.mtzionucc.org/uploads/1/3/1/6/131637919/fd40967eb3.pdf
    • http://files.heartlandjungians.org/uploads/1/3/0/7/130776841/ziniruper.pdf
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdf
    • http://files.thezendragonfly.com/uploads/1/3/0/9/130970014/pewekatubi.pdf
    • http://files.uprisingstarsinc.org/uploads/1/3/1/3/131379045/gowofikur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fakemoj.files.wordpress.com/2020/06/41141563775.pdf
    • https://wivotomamal.files.wordpress.com/2020/07/55941769943.pdf
    • https://verisemi.files.wordpress.com/2020/06/tixiwituzekabudo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.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_off00005a78.bin
36d404060438c98b4dbc77bdb6e70ad7052da8929a98e4c72eb38328b6796168
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A78 5124 bytes
font_01_sfnt_off00006be0.bin
b04b68c5972586e36dcaf53642b1de64139c66231ef8c37b136f3c04b256c5df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE0 15056 bytes