Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7a9493028a4072…

MALICIOUS

PDF

42.4 KB Created: 2020-09-20 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca4dbc145cf9352a273de53e26f05849 SHA-1: 4f6e5911f4a7a62557011456c87eaf3652a05615 SHA-256: bf7a9493028a40729eb8e298742171fa7b65e496eb2ce01335978c3516223d87
152 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors and part of a link farm. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'ged math 2016 study guide pdf'. The primary malicious link identified is https://ttraff.me/wix?keyword=ged+math+2016+study+guide+pdf, which likely leads to further malicious content. 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.me/wix?keyword=ged+math+2016+study+guide+pdf
    • http://zelari.nbspshop.com/uploads/1/3/0/8/130874198/7653327.pdf
    • http://files.liquidsunshinedesigns.net/uploads/1/3/0/7/130739227/vekuw.pdf
    • http://wuriv.seasaltnomads.com/uploads/1/3/1/3/131383544/fufokunoxa-lomomazaxer-dufuwatural-dodufilatotu.pdf
    • http://files.ssapsychology.com/uploads/1/3/1/1/131164311/juwapeni-revupumafixo.pdf
    • https://3a0ad06b-1a42-4a79-b01c-b6553cd5a709.filesusr.com/ugd/b7082a_2914ba4e37f04619acc63fc3f3de5ab9.pdf?index=true
    • https://f4070a95-2f64-4e85-950f-2817a5439c6d.filesusr.com/ugd/e78b77_9a209f6b8997414f9c9862e111a84dca.pdf?index=true
    • https://0f772a63-52bf-4e8f-aa4b-47980c079df5.filesusr.com/ugd/b1277d_a9154c027d36450494607a2ee64fc3c9.pdf?index=true
    • https://79e7cb1e-6a6d-482c-a49c-c1f327652fd2.filesusr.com/ugd/08fe48_51152438fed9466497ef72eca2b3b33a.pdf?index=true
    • https://14b3ea5f-67a4-4c57-89cf-e2ab0e924e1c.filesusr.com/ugd/4aae87_69296a3024f94c0eac1d5921c55e5189.pdf?index=true
    • https://712b75f4-8f81-4c30-9430-1bdc21991752.filesusr.com/ugd/7be1cd_15c72f7f1576416b8847e07ecd2193e8.pdf?index=true
    • 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_off000063e0.bin
0b57f10eaf7ca5f369013d77a8abd0877e0b1b16ad8ebdee7a8e59a937cd90eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 5940 bytes
font_01_sfnt_off00007808.bin
a67860208b2646a5feeb1e521ab21cab63ccf97f1c1baae2d458647b711be71d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7808 10420 bytes