Malicious PDF — malware analysis report

Static analysis result for SHA-256 f271d0b44148543f…

MALICIOUS

PDF

35.6 KB Created: 2020-08-14 01:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe480b881ec41372be0cf44e73a7730 SHA-1: fc95baf8e4f02e935e4999f457e9da4ac6bd054f SHA-256: f271d0b44148543f35e32af88126cec5a0f73d717478ef72b816ef1984b8bd37
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially garbled, contains text related to 'Aqa physics 9- 1 textbook answers' and a URL that appears to be a lure. The presence of a link farm and the ML classifier's high confidence score further support the malicious intent. The primary attack pattern involves redirecting users through malicious sites, likely to facilitate phishing or malware delivery.

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=aqa+physics+9-+1+textbook+answers
    • http://pigowil.azpattersonedu.com/uploads/1/3/1/4/131407005/nekadewifugabab.pdf
    • http://files.cesariomateus.com/uploads/1/3/2/6/132682204/gupomoje.pdf
    • http://files.jsihomeinspections.com/uploads/1/3/1/4/131483386/ae01ba8090.pdf
    • http://files.ocmunc.com/uploads/1/3/0/9/130969974/4849623.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/jessi_brianna_naked.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/66827756362.pdf
    • https://cdn.shopify.com/s/files/1/0433/8378/3575/files/zuxiwakixovuxovowo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/89054136965.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/rezubasexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1558/5448/files/jirudakisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/31937828387.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/cinema_hd_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/4635/3561/files/adobe_cs5_master_collection_serial_number.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/tibirageroneluvarulesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/82670221721.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/fexesal.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/25868566005.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_off000048b5.bin
1290e0713de0bb5e87d65f78aa35bc6484f84b518c057c20513b0f76c733628b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B5 5808 bytes
font_01_sfnt_off00005c96.bin
f45ee3daa992b9f1046c00caa79306d1f723b97405d7b494f65122119e67b345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 10344 bytes

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