Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c237892f79f568…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 06:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 213cfb874d53fa1a647745809c79ee25 SHA-1: ca61f1ca5c5e94d41e511bcf3b77bc7566b33fac SHA-256: 83c237892f79f56874da9aef677bbf54d53afad9c3427426f33a9ce03aec55db
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a service manual. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure suggests it may contain embedded JavaScript for link manipulation or redirection.

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/wix?keyword=jeep+wrangler+service+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1882/0511/files/2007_honda_fit_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/polozunuxapuxobeton.pdf
    • https://cdn.shopify.com/s/files/1/0436/8121/8710/files/vekatuzukuxedoxapazekepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/jerefari.pdf
    • https://cdn.shopify.com/s/files/1/0439/1629/6360/files/arithmetic_mean_and_geometric_mean_problems.pdf
    • https://static.usrfiles.com/ugd/314c35_87fdcc2bb58f4cb882375c9777b92158.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_aaedbaf283ad45a088001a8f7002a606.pdf
    • https://static.usrfiles.com/ugd/7dd30d_c77aff78060e4e31b538306817c8dd4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ddb78312ce49768f5daf9ceeee655e.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_ea6bd7dea6e84e70b210e7965c5d6299.pdf
    • https://static.usrfiles.com/ugd/fd7405_f17b3bb1d5844f409d75043f9ff65699.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d7f62b6f81141dda8cfe8bf027d8c86.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/central_air_conditioning_systems.pdf
    • https://cdn.shopify.com/s/files/1/0435/7976/8995/files/datasheet_of_mosfet_irf540.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_off00005dc9.bin
eeb9607fab241463d4951ef5f6842d8f3d9787f0de21f2a870b4836b9e53301b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 5396 bytes
font_01_sfnt_off00007021.bin
366fd355867423d482360b86f1cd19e10cd39f3371a6de32c4f98e8e41ce3b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 9920 bytes