Malicious PDF — malware analysis report

Static analysis result for SHA-256 881cc5091d128c92…

MALICIOUS

PDF

47.8 KB Created: 2020-08-07 21:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f07d33a2ca9a14ba5c3e679215eacbd1 SHA-1: a7f9b2f8b7f77da9018091aad468242af189ecaa SHA-256: 881cc5091d128c92c0538462f0444fc3afd6e2eb04660dd7a43d6c036e3b8bc8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a "ccie sp workbook pdf". The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm, likely for SEO manipulation or distributing malicious links. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent.

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=ccie+sp+workbook+pdf
    • http://files.hebshf.com/uploads/1/3/1/8/131871462/7644777.pdf
    • http://files.barkerstrathcatholic.com/uploads/1/3/0/7/130739974/ziladibevob.pdf
    • http://files.lavenderbluevintagedesigns.com/uploads/1/3/0/7/130775737/7719268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/pikujeranavadirod.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/58806120430.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/39580179803.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/inquisitor_40k.pdf
    • https://cdn.shopify.com/s/files/1/0438/2933/0077/files/words_their_way_spelling_inventory.pdf
    • https://cdn.shopify.com/s/files/1/0432/5802/0004/files/noxazur.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/68147536738.pdf
    • https://cdn.shopify.com/s/files/1/0434/2700/4577/files/31332171155.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/54160521295.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3186/files/dojojojabodedumatis.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_off000077f2.bin
9d7833d4b81521344fcbfb1cb8534d542b85f5ee5046601ec7848795cdd740f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F2 5108 bytes
font_01_sfnt_off00008975.bin
76f0987b0e2e19a95bfe585ae7ac243d49bbcb50a9f6b7239c5b18f767feed42
pdf-font-stream PDF embedded font (sfnt) at offset 0x8975 12712 bytes