Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f61945a98fd821…

MALICIOUS

PDF

36.4 KB Created: 2020-08-25 08:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86a0084c6ebae5279431f5ac81f4d87 SHA-1: 41c71be7486a22c243ce42e4e96fb2dd4bb98146 SHA-256: 25f61945a98fd82183286bd5f801157dbd72032888f13a0cffd4e8e3fb15b947
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a PDF link redirector and another for a PDF link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=barbie+shopping+game+free, which is likely used to redirect users to malicious content. The document body contains garbled text but also includes the same redirector URL, suggesting a lure related to 'Barbie shopping game free'. 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=barbie+shopping+game+free
    • http://files.serenarilab.com/uploads/1/3/1/3/131397938/kelobawufizajumaxegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/suwibovuligele.pdf
    • https://cdn.shopify.com/s/files/1/0443/0757/9036/files/hernia_hiatal_gpc.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/zotuwalibirisuwomobewomor.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/danukigonoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/iit_jee_advanced_mathematics_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/xosusanunezeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/2838/0839/files/pdf_link_open_new_browser_window.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2792/files/bcbs_florida_prescription_prior_authorization_form.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fec.bin
ec43d721a1276dd35569222c55913f562874981d52ecc0fb84700a1c1d0a1e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEC 5472 bytes
font_01_sfnt_off0000625d.bin
a4800db73789115eecd543be3ee4f3941ac77f72e948d31881a3616ac5cb65da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625D 10264 bytes

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