Malicious PDF — malware analysis report

Static analysis result for SHA-256 843a2190006c4a6b…

MALICIOUS

PDF

36.2 KB Created: 2020-08-24 16:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aa017e5e56bca5e861872173a60d497 SHA-1: 1b2d65dfd32b17658ceaf3e2b8443d9303df600f SHA-256: 843a2190006c4a6b57cdc6ad32507cca0d87bd4bef5c3f168177969acd0b8876
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting seemingly benign PDFs, but one critical link redirects to known malicious infrastructure. This suggests a link farm or redirection tactic to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=sayang+2+versi+angklung+malioboro
    • http://files.wilchesterelem.com/uploads/1/3/0/9/130969809/b9b86e29e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/7617/4234/files/exchange_transfusion_neonatal_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/biodiversity_conservation_and_sustainable_use.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/55798312735.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/xegelivuzurewosaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/academic_writing_examples_reports.pdf
    • https://cdn.shopify.com/s/files/1/0438/4954/7938/files/calculus_101.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/archery_master_3d_game_unlimited.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/jezaluguripozopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/ohio_drivers_license_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/4877/8400/files/75638250365.pdf
    • https://cdn.shopify.com/s/files/1/0447/8536/9239/files/windows_command_line_reference_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/38518169123.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/26237906531.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_off0000500c.bin
6278753de257208fddc6d5b89f0a96ff028d31f5420e40b903e2f1f38a940240
pdf-font-stream PDF embedded font (sfnt) at offset 0x500C 5604 bytes
font_01_sfnt_off00006312.bin
b466bdb87dbab9e2f76299b792b9677fe785ccfebf782e3a7429bcf9ce25c57e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 9636 bytes