Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0efde14dad0cb7…

MALICIOUS

PDF

38.7 KB Created: 2020-08-15 05:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fb684c1425bbe8a7696940ae30899f1 SHA-1: 3bb8e30292c8fa4e524dc320508a2d09b3932fe0 SHA-256: 6e0efde14dad0cb7d9b4f37c7665da30683667b71ca7b04f41088ba19d5dba78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, masquerading as song sheet music. One of these links, https://ttraff.cc/pify?keyword=chitty+chitty+bang+bang+song+sheet+music, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though partially corrupted, contains text related to song sheets and the authoring application, reinforcing the lure.

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/pify?keyword=chitty+chitty+bang+bang+song+sheet+music
    • http://files.mtsarmusic.com/uploads/1/3/1/3/131379409/gufuzi-xosizavono-pitetesezavok-wegupipiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66491839223.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/17285818121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/an_occurrence_at_owl_creek_bridge_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/xivoduvi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3593/4370/files/gosenadixizote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0189/6347/files/the_candy_shop_war_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/74148114766.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokadexowigexavutezirero.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/wikosularufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/71473935901.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004afe.bin
9e2866a10b7fafe91da79db0cfd4c1cdb6b85691d33ab6f116c5ed767a255be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFE 5232 bytes
font_01_sfnt_off00005ca7.bin
412e54f073925f517db63f272c820db47e947673446222fc3e97889c3ec9dc18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA7 10364 bytes
font_02_sfnt_off0000800d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800D 4324 bytes

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