Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a770c0fa8bedef…

MALICIOUS

PDF

46.8 KB Created: 2020-08-25 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6ee9cb44726c95307bf85539ce89c81 SHA-1: e03a0801d5fe994f4f8f0ef759f1e2f105a13a89 SHA-256: 35a770c0fa8bedefed7971cdff03d5fe31bec64c9491d40c48b50cb8906ea8d2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL suggests an attempt to lure users to a harmful site. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=you+are+the+reason+song++musicpleer
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdf
    • http://files.olympusvillas.com/uploads/1/3/0/7/130776655/lajeruxonosufo.pdf
    • http://files.nysekwang.org/uploads/1/3/1/4/131406060/7577055.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/62095407892.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/74394359271.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/rijupuwugoxewaxor.pdf
    • https://cdn.shopify.com/s/files/1/0436/0654/0445/files/tipos_de_brocas_de_perforacion.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/68605990869.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/11310228744.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/transformar_angulos_centesimales_a_sexagesimales.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/archies_manchester_menu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/33488734089.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1054/files/hacks_para_agar._io_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/sunavujugipubamovatu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e9.bin
94fdd4dd4c0f18f8f624b1b7d0c4afb7ffd42863d0331566c3c50220bd9947d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E9 5308 bytes
font_01_sfnt_off000072d0.bin
cd50b870c766371d9e1f210ccccf8254c9f8bf7a6bb1801f5acbb70d8e218b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D0 10012 bytes
font_02_sfnt_off0000955d.bin
488e8ceaee5053b7fdb36ba6acb38a177ae29a1af8feabdba303665cf81c4f7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x955D 17052 bytes