Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7419d6a6558158…

MALICIOUS

PDF

86.9 KB Created: 2020-11-03 02:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc185d85f3c7d0ff7d7d1e1bcc0f546a SHA-1: bda9e750a45c2df6a117233dc1d2eedcb6e39bde SHA-256: fa7419d6a6558158aa3da7bfe32c172004336acf81f5996f36779c735f91a420
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many of which point to potentially malicious or link-farming infrastructure, including a critical redirector link to 'cctraff.ru'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to redirect the user to a harmful site.

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://cctraff.ru/strik?keyword=athens+city+schools
    • https://mematuseb.weebly.com/uploads/1/3/4/5/134516495/9729159.pdf
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/166df15f15356.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f9727ea76c11.pdf
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/7943530d.pdf
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/xulogoroti_turabika_wugipusu_kexedugu.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8cfc4772a92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0504/5046/4945/files/bestop_sunrider_soft_top_installation_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0506/5831/2366/files/bluetooth_apk_free_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8725/files/cat_mario_game_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0502/8410/1790/files/foundations_of_orientation_and_mobility.pdf
    • https://s3.amazonaws.com/pafiganovavi/electric_field_graphing.pdf
    • https://cdn.shopify.com/s/files/1/0431/6499/1649/files/crop_in_foxit_reader.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_off00011957.bin
4498e5e5519c305f34c62994babc1d0541ba50a9fa95cc1421377601f57181a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 4672 bytes
font_01_sfnt_off00012948.bin
54b3e7f67ae29b37665b2ba315b24bc419de5381d6a1d5e412a519d413392cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 11116 bytes