Malicious PDF — malware analysis report

Static analysis result for SHA-256 37159ca179e99e13…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 20:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45f820a07853007f0bf448d36766da9 SHA-1: f49df0761f8a7a46cf3b920c6fe206f820e8c894 SHA-256: 37159ca179e99e1311902cab925dbbd0c5c4f1f1df94815f581460305d1fbe13
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a specific redirector URL that is known to be malicious. The document body, though heavily obfuscated, contains text related to 'Prince william county court forms' and the malicious redirector URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=prince+william+county+court+forms In PDF document text
    • http://files.thecheckupapp.com/uploads/1/3/0/8/130874330/60446777f35a591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/guwiwak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/xoretenuzo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/blank_august_2020_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4402/8068/files/83046232282.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/bewudifanogawogute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8307/5477/files/37952907322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/81660766455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6653/0719/files/15943011128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/94185445460.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a3e.bin
c855dbe56752c2ec32f0863abab801c906891e398896ab65a1724466cc64e574
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3E 5220 bytes
font_01_sfnt_off00006bf9.bin
ecffb78bbce02cef37a18c12b9983ee5fceaa89442433ba4ff6ca9997ee86596
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 10460 bytes