Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e02e992978f405…

MALICIOUS

PDF

48.4 KB Created: 2020-08-21 06:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f84a3742907e402998d0721aabb16c26 SHA-1: 127ffccaf40a98b44f91c93d4c3efcf103d21f0a SHA-256: f4e02e992978f40585ea3a7afc9318d218c2a99205ec604c595bfece197d21e6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as information about Android devices. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is designed to lead users to a malicious site. The PDF also contains a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious link.

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.cc/pify?keyword=android+9+f%25C3%25BCr+samsung+galaxy+s7+edge
    • http://xitekijo.thetruthstandsforever.com/uploads/1/3/1/8/131856408/tuwajosen.pdf
    • https://cdn.shopify.com/s/files/1/0436/4225/7561/files/ecocardiografia_tridimensional.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/batman_the_dark_knight_returns_comic_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1583/8628/files/balthazar_menu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8892/9187/files/acanac_internet_speed.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/xotipevoruwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/82123158402.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/wagner_bridal_chorus.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/kogoxujurevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/30441688651.pdf
    • https://cdn.shopify.com/s/files/1/0436/4002/9344/files/59678266561.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/91807641722.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/supa_hot_fire_gif.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_off00006d49.bin
04d70dabe0b1f538728ce42ca1dc2d86c809028b20a091e79a0885829686e328
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 5544 bytes
font_01_sfnt_off00007fe0.bin
434d0de92a8f789a03c995372d6aef8bf3ecb100da7a155e3dc068df47dfdcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE0 11180 bytes
font_02_sfnt_off0000a4b7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B7 4324 bytes