Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0fc22f4a437fb8…

MALICIOUS

PDF

42.2 KB Created: 2020-09-12 10:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efc9ea81d55f1c7ce11a3f84c6c00b91 SHA-1: 9d2f9b9a6d9ef71a68ca9a68eb095a7e1cf3fe5a SHA-256: 0b0fc22f4a437fb894984bb0febf7831282d8fcec006b6f589f40b18e2cae450
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, masquerading as stress management worksheets. One primary link, 'https://ttraff.link/wix?keyword=stress+management+worksheets+for+adults', redirects to malicious infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=stress+management+worksheets+for+adults
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/nupapusefaxikemoxov.pdf
    • https://cdn.shopify.com/s/files/1/0434/7484/5858/files/xugugedozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7823/5798/files/git_undo_commit_keep_changes.pdf
    • https://cdn.shopify.com/s/files/1/0463/2251/6130/files/gikunamuvubewukog.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/8534639944.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/free_powerpoint_templates_business_pitch.pdf
    • https://cdn.shopify.com/s/files/1/0436/9793/0393/files/3140905937.pdf
    • https://cdn.shopify.com/s/files/1/0463/3234/6523/files/recent_android_version_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/wapazexix.pdf
    • https://cdn.shopify.com/s/files/1/0434/0580/3687/files/nuvuzuvugitulubebemamab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4696/9237/files/vunikojopo.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_off0000662f.bin
5344ddc52e12814471bee9d31329f09bc06aab8f2afc9ca5365705115bc8120d
pdf-font-stream PDF embedded font (sfnt) at offset 0x662F 5580 bytes
font_01_sfnt_off0000790a.bin
0e3c44499467d41370ef25332bbeef003080d358df86c9f33db1776be90d1116
pdf-font-stream PDF embedded font (sfnt) at offset 0x790A 10352 bytes