Malicious PDF — malware analysis report

Static analysis result for SHA-256 9962b61bc9a77d14…

MALICIOUS

PDF

61.0 KB Created: 2020-08-24 00:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f67ffa15f8c0db0d09e25601b3d9814a SHA-1: 6f88777fc9b9ced05c56356fd028a6d7e56076a8 SHA-256: 9962b61bc9a77d14198bfb20e8bef10b0b38d4e0284a45025520fb6212150bff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to known malicious infrastructure, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to 'Brown forman corp annual report' and a URL that appears to be part of a link farm designed to manipulate search engine results. 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.ru/pify?keyword=brown+forman+corp+annual+report
    • http://zozatep.glacier-basecamp.com/uploads/1/3/0/8/130813765/6917490.pdf
    • http://files.mrscox007.com/uploads/1/3/1/3/131398008/d9a02cc6.pdf
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/1453498364.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/42025041470.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/gilurusimefovi.pdf
    • https://cdn.shopify.com/s/files/1/0463/2366/3008/files/26042596507.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/abrsm_theory_paper_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/similarities_between_andragogy_and_pedagogy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/framelayout_in_xamarin_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/tovixutup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/introduction_to_blood_groups.pdf
    • https://cdn.shopify.com/s/files/1/0463/4066/9602/files/tusopajijewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/job_acceptance_letter.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/antonin_artaud_heliogabalo.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_off0000b20d.bin
cab63fbe801e8cb44db5036aff4db3271eab0abe2736a5565a820d25615b6560
pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 5124 bytes
font_01_sfnt_off0000c373.bin
4854e3f16349da65bd74091bf9da6ec2cbfeed95970a4fe44374240d0c831d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 10372 bytes