Malicious PDF — malware analysis report

Static analysis result for SHA-256 170694b0c96d4735…

MALICIOUS

PDF

40.0 KB Created: 2020-10-03 19:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0903ceb57feaaa94e69e7cf5d31ca2d1 SHA-1: 5acbf1e36f51d547ecda6dd5aad49ff06636601a SHA-256: 170694b0c96d4735fdcfe9311c3e333de446f4892227f9ba53584f37f256c27a
154 Risk Score

Malware Insights

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

The PDF document contains a lure for free fidget spinners, directing users to a malicious redirector URL. It also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly indicate malicious intent to redirect users to harmful content.

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.link/pify?keyword=free+fidget+spinner+online In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6dabb26-5e90-4331-b971-1be53cc76a75/lupugafolosenalonani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05aab4e7-e68f-4604-994d-12d160b973ca/bazopufavisip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a737e2c-cf01-4f83-a0b2-5aadcf1c3f15/zexebigutudamolaneburijof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/64328525624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3e3e9d-1b63-4790-9692-4ded154d7d23/6688480889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9718825e-5e3a-408e-a739-cb29b1419ae1/rabatozojofoxosotebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561bbbc1-4bc9-47d3-b5d9-ddae33801632/33541474015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25dd201-9f85-41c9-9ff0-1c09557ce53c/suvewosatopititomem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d09cc5-6b9b-49da-9362-cc97929bb0b0/lemubasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2271/4533/files/salubowuvasoros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5944/5914/files/middle_school_guide_to_ruling_the_world.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 4952 bytes
SHA-256: 61a27846b9b702bf5b9d9a2b89829996646c9a2aa10cddc89457cf2d373bd884
font_01_sfnt_off0000721a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721A 9872 bytes
SHA-256: 73ba54a6a3aa51ae5a674af60bf9fa0872432c06169eb5df43278d8f6e1b304e

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