Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cffd20d26f51e3…

MALICIOUS

PDF

41.8 KB Created: 2020-08-01 20:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 344d36859af8c82a6588e97c55b45a1c SHA-1: 6c6efddab9f7dc14ab3549c4563b111cbefff255 SHA-256: 84cffd20d26f51e394fc833c37e6d805959b6047dabe12b0acd81c5c50dc5a9e
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm, indicating an attempt to direct users to harmful infrastructure. The embedded URL points to a known malicious redirector, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to exploit users through malicious links.

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=avery+5167+template
    • http://files.karleekilker.com/uploads/1/3/2/6/132680998/fodefajarol.pdf
    • http://files.spinesurgerycleveland.com/uploads/1/3/1/4/131408581/8e316c1df0a5614.pdf
    • http://files.geoffpelham.com/uploads/1/3/1/4/131453998/8622246.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/vozupedujoduxedelid.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/57359581398.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/gudidapobegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/70270855044.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/66964429037.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/79640017903.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/43538115254.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/88387781837.pdf
    • https://cdn.shopify.com/s/files/1/0438/4666/4349/files/git_restore_deleted_branch.pdf
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/maxaremexit.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/pafewufivelewefarepidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/92255885421.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_off00005e7b.bin
2f449411a3080b1575001fd28fcde56c037cfe4454f32b9164d0cd7e0a720f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 5348 bytes
font_01_sfnt_off000070b6.bin
2bd3dd54c49139d56a70991e2ef1b940f3faf0063e42268215ab6eb718e11bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 13080 bytes