Malicious PDF — malware analysis report

Static analysis result for SHA-256 6127ff3115ee6e59…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 18:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca4f9abba108812a761c51b546d5747c SHA-1: 6b29d9cac7eb09ffd8ac98b11e4312aed60015cf SHA-256: 6127ff3115ee6e5905556b3024a543dba268941b79e9f4a7dd2290a6863dcb36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one pointing to a known malicious redirector. The document body, though partially corrupted, includes the same URL and a benign-looking topic to mask the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating it's designed to redirect users to harmful sites.

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=school+uniforms+on+sale+cheap
    • http://beniw.joy-for-dummies.com/uploads/1/3/0/8/130874493/jorapa-bibupasam-vulubujuse-xevor.pdf
    • http://tilatusix.mdccleaningservices.com/uploads/1/3/0/7/130775971/0489bd3e2e5.pdf
    • http://files.symmetricallybeautifulbysalina.com/uploads/1/3/1/4/131438046/bixilifatima.pdf
    • http://fusukako.mcnamaragypsies.com/uploads/1/3/1/4/131438500/f1410b439a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/zazidenigukix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4643/6006/files/gejipapegajijuxusezuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2385/7824/files/hindustan_oil_exploration_company_limited_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/43990702521.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/76205393513.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/kusisorifiza.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/jotetopowamog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/neolithic_revolution.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/81007556852.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/64494992916.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7350/files/51812070288.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/28907273310.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_off0000657c.bin
c5f1572b77c7c1b80083c7ed8493de4fa377db7406a5ad91e3a56313b9ab6f54
pdf-font-stream PDF embedded font (sfnt) at offset 0x657C 5356 bytes
font_01_sfnt_off0000777a.bin
de158a007b0c4b0e7e7f36f22c2fa2df18224c9b4db259e89651875989d073da
pdf-font-stream PDF embedded font (sfnt) at offset 0x777A 10384 bytes