Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ade8c68ac7b3542…

MALICIOUS

PDF

30.4 KB Created: 2020-09-04 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3f94374827776bf6924f28f01f3c79 SHA-1: 5eed28e825733d9c7b7abf6c9b45b4aedb13de75 SHA-256: 6ade8c68ac7b35424c62479eb0440192b33b6837c6131820b07fa7560efe53e1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Crowe horwath llp annual report' and a URL that appears to be a lure. The presence of many links to external PDFs, some benign and one malicious, suggests an attempt to direct users to potentially harmful content or phishing sites.

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=crowe+horwath+llp+annual+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/toronto_alexithymia_scale_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/neuroanatomy_through_clinical_cases_blumenfeld.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/90789003234.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9287/files/manab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/amcat_aptitude_test_papers_with_answers.pdf
    • https://static.usrfiles.com/ugd/868b90_57f49cc932df49159f3b667f99066ad8.pdf
    • https://static.usrfiles.com/ugd/ef253e_bbd65d15133a48c3bf03000ef70563b9.pdf
    • https://static.usrfiles.com/ugd/738632_d68288df6dbc4c21a7fe081a113cee50.pdf
    • https://static.usrfiles.com/ugd/f09a9d_66f6539b75144243abfb945bf497d1f6.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/banque_nationale_d_algerie_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/24069378480.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/nigokibare.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1900/files/9484875018.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_off00004103.bin
0df8f3a4be80c9a9b1315507c5ae25fe05430ce693db9487c070e6fbebb5c14a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4103 4724 bytes
font_01_sfnt_off0000511a.bin
ac3b845d86653981bb80ff55ced70451165362f091adefbe9d1293802a5b7c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x511A 8212 bytes