Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4c224e51ec1e88…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 06:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d00c75e0595a70de8002b6a21a941c9 SHA-1: 554510a6bead785ea8e0db9812e76502e7e292c6 SHA-256: 1d4c224e51ec1e881b8aa6bc34d3a36be5639358159253a96d9d2fa175ce0d1d
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a seemingly innocuous keyword. This is further supported by heuristics indicating a malicious redirector link and a link farm, suggesting an attempt to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of a phishing or redirection attack.

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=gone+with+the+wind+lesson+plans
    • https://static.usrfiles.com/ugd/b8c837_ee784776acd84138a10d711a70b9fd37.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_0278e2a13caa47a99f5e1b6c73b374c7.pdf
    • https://static.usrfiles.com/ugd/d01287_89d64588d18f497c82e78e983e029f3b.pdf
    • https://static.usrfiles.com/ugd/b11f6d_f9d9d3cdcc1345a7a6ef69972ee7b498.pdf
    • https://static.usrfiles.com/ugd/b8c837_3eb302010e414e41a3cf82b8467ae960.pdf
    • https://static.usrfiles.com/ugd/b7ed05_0b0b91876d1c4a75b1b44a00e6d60534.pdf
    • https://cdn.shopify.com/s/files/1/0438/8824/6936/files/doruguvuxodo.pdf
    • https://cdn.shopify.com/s/files/1/0465/9580/1253/files/48044244461.pdf
    • https://cdn.shopify.com/s/files/1/0439/3389/2763/files/breast_cancer_etiology.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/functional_grammar_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6572/files/xorovitikoxixam.pdf
    • https://static.usrfiles.com/ugd/98857b_7215740447c64869963d2bca2f43745f.pdf
    • https://static.usrfiles.com/ugd/8acad3_b6db805a438c4127890deb8337dbfcbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5454b90080f4979982861724bee7770.pdf
    • https://static.usrfiles.com/ugd/5e8de6_58d20bd3db9c4240a0b20f54adc06ce5.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/
    • https://static.usrfiles.com/ugd/b8c837_3eb302010e414e41a3cf82b8467ae960.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000768d.bin
24467c4febab8b954e4da037397cbb526cf2c2c7c4ebaf9096e6797ede23f765
pdf-font-stream PDF embedded font (sfnt) at offset 0x768D 5072 bytes
font_01_sfnt_off000087e1.bin
face96d7795b84e8cbfdb8c5a9abf486e7cb62b1195959f0d7d6db436bcf59c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x87E1 10772 bytes