Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe1fb3de4408ee0…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 07:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53cfdd941f4c340473001aad61fd8293 SHA-1: c35c2ae9d97848a8a8dd6f324e50cdabd4e60f2d SHA-256: 0fe1fb3de4408ee0f45eae5c5d77d4176d0534e290fd6a4704096f47648c997a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'Super smash brawl'. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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.com/wix?keyword=super+smash+brawl+unblocked
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/community_worksheets_for_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/voki_create_your_own_avatar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zimupumunilojoduwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/playboy_magazine_online_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa8ddde92ec6495d841936d40d884399.pdf
    • https://static.usrfiles.com/ugd/d5cf39_01966e3ede5e4168918a00c05b7093ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f5505025d5b4854ab95cd8b73e34d04.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/vozejepewaxumobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/62052645578.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/caracteristicas_del_genero_dramatico.pdf
    • https://cdn.shopify.com/s/files/1/0437/9813/4941/files/zafevatopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/6468881687.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/fekotakidobizerof.pdf
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/advantages_of_information_technology_management.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/firafik.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/wozaluji.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005854.bin
a3e01129e05d48065f8e5c7dc638fe4ccf62d0691846302bf1a78c72ff7f3bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5854 5712 bytes
font_01_sfnt_off00006ba6.bin
5f5db59684226799a413506f80641eabee626a1caa06e58cc5a75228dc5cc4bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA6 15112 bytes