Malicious PDF — malware analysis report

Static analysis result for SHA-256 870c83e1b8284d1c…

MALICIOUS

PDF

76.3 KB Created: 2020-08-10 14:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70234d3ce89e60ffed0bd224596ba84c SHA-1: 39152e4ff32f4170702e7f1a932482d7c772400b SHA-256: 870c83e1b8284d1c60b17f6f635877cdafee792847ab165ef3d12de6df891160
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that is part of the redirection chain, suggesting a phishing or scam attempt.

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.com/pify?keyword=apprendre+grammaire+francais+pdf
    • http://ledus.takodadogs.com/uploads/1/3/1/4/131438474/52a2738ce.pdf
    • http://files.samdrakeracing.com/uploads/1/3/1/4/131438557/dedagu_wodawanidepadu_xiwibat_dibuk.pdf
    • http://files.roadhousegrillandbar.com/uploads/1/3/1/8/131856995/441713560235.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/nusutegikesoviju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/romekimupubezelazuwek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/college_algebra_gustafson_11th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/vuzefonowazarewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/file_clerk_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/73597215886.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/ethiopian_federal_supreme_court_cassation_decisions_volume_21.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/clipboard_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/cover_letter_for_teacher_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1126/files/72247831204.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5798/files/tirivibesowoguwis.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_off0000da2e.bin
0d5356bc33fe0e8ec246d528992351ad0572b73f2e4e6542dc3b102f70cb4099
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 5432 bytes
font_01_sfnt_off0000ec8d.bin
18a2e2a5fd5a6d15b3c131690395dfe5fd4c1d281542a99813320c9e74b17bcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 18028 bytes