Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b78070923174c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-24 15:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39b7d929dab8cefd370c0403bece7098 SHA-1: 3f0e78197db0f278ce2c1e34eaf3077feed02f2f SHA-256: 898b78070923174cb52dcc0cd53000c4d2a93aed9e3e3edb1eb77e3a1ea18050
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=edit+pdf+online+free+no+signup'. The document body also contains this URL, alongside numerous other links to PDF files hosted on Shopify and other domains, suggesting a link farm for SEO poisoning or traffic generation. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious infrastructure.

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=edit+pdf+online+free+no+signup
    • http://zotus.marcocalandra.com/uploads/1/3/1/4/131453060/rezutakotukus.pdf
    • http://files.deltacouncil.org/uploads/1/3/0/7/130775109/vixawidopu_venadolimu_korowi.pdf
    • http://files.abiblicalcounselor.com/uploads/1/3/1/0/131069812/fenito.pdf
    • http://files.cattongrovecentre.org/uploads/1/3/1/8/131871602/3092012.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5563/files/checkbook_register_template_free_excel.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/61367250327.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/nizatisazujewukogalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/zoxunakatixisode.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/types_of_compound_leaves.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/70252654812.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/juzimedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/52744078256.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006837.bin
7430dc09509ef0d55c936fb9aa6da428af18d0000b1141f6a1b0a7d4777cabb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6837 4956 bytes
font_01_sfnt_off0000792b.bin
6c08cb4224cbf33d1d771c06568fcb5f34baa8df90381408ebfebff9fd670ff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x792B 10248 bytes