Malicious PDF — malware analysis report

Static analysis result for SHA-256 12acd310945dca05…

MALICIOUS

PDF

70.8 KB Created: 2020-08-29 11:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03fb3df2e5c34ffc9494e67c6da84326 SHA-1: 0aab55a4b70d2f272e17ffbb829ef374114a121c SHA-256: 12acd310945dca0513dab0f3cd764820745759ecd47870d855d0a5830c8d4deb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to FGTS, suggesting a phishing or scam lure. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect the user to a malicious 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://ttraff.link/wix?keyword=novo+codigo+de+movimenta%25C3%25A7%25C3%25A3o+do+fgts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/3266/9334/files/advanced_analytic_methods_in_applied_mathematics_science_and_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/detalosanop.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/movies_in_saginaw_mi.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfbe03bef4f94b789c901e4f3cd1ffa9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4319505807b345dcafe18fd28e4b4ed3.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a577f8b893433c9ea88e071f5676a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e771c18a6e3438b96fec88c96e6e649.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2f34cd483544153a5171f0f43347676.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0f6d74d10bc47bdb90ccbb503061549.pdf
    • https://static.usrfiles.com/ugd/b8c837_76c144c1d3b7491aa1deccc89f04822f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad908162b8fe44ed80bf2d3668d8be69.pdf
    • https://static.usrfiles.com/ugd/b8c837_f123701d040f4e1290fc6ee77226c2f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_916e44f6fad5480fa1539ac33117e80c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e320280654c84fb89998e5a5cb402258.pdf
    • https://static.usrfiles.com/ugd/b8c837_4226bc9fb25844a5a898b5329b05a88e.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_off0000d001.bin
8086e6b24dc4d77c71859f0d8dcc42f5314f1178b32e081511ea6e2fae9460b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 5744 bytes
font_01_sfnt_off0000e2b1.bin
f0de65ce3c67af6235d72fe7a4cec86b795061df32d12fb5340ae5d7c76e902c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 14080 bytes