Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7b04e2f6878359…

MALICIOUS

PDF

65.7 KB Created: 2020-08-14 05:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 791917fcfadc6f1a66d1ad8efbc36821 SHA-1: 92d7917fa649ae98e1ba13b617381e40ee941d2a SHA-256: 5f7b04e2f68783591865b6942adf6b3f093a17078f086a7c8719339e1d206385
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the malicious URL, suggesting an attempt to direct users to potentially harmful content. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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=radiology+chiari+i+malformation
    • http://files.photographybysherv.com/uploads/1/3/1/3/131398605/gamasebufiwaw.pdf
    • http://files.justiceamick.com/uploads/1/3/1/4/131453146/4658394.pdf
    • http://files.ncosea.com/uploads/1/3/1/8/131871984/panudatusufoluf-kogoxojobuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/levafifusexipamofozupogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/exercice_orthographe_6me.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/dinghy_towing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/xetinezuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/chuyn_i_file_thnh_nh.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/datuxozoguwixasodumek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/dumusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/389628068.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.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_off0000c28b.bin
f5d24198f6a03297e1a90743de59d364b08a53f3a11fd9fd8aee61ca04c7b7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 5368 bytes
font_01_sfnt_off0000d4ab.bin
87865889509ddd37dc71b77c270264acc40bb7ee9cc36b004206ddd081a7b7b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 11664 bytes