Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff1f4619efa5461…

MALICIOUS

PDF

52.1 KB Created: 2020-08-14 23:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a4d96bba91c03c7d7f39b291c19adde SHA-1: 2b0f83e7d3d2cce865305eacd701c38fa07079df SHA-256: 4ff1f4619efa54617d4a8a6803d646395856022377c3e73e2e5b38699ead5d9d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, however, leads to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a reference to the malicious URL, suggesting an attempt to disguise its true purpose as a link farm.

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.ru/pify?keyword=bestiario+pdf+arreola In PDF document text
    • http://files.thecornishgiftco.com/uploads/1/3/0/8/130874246/zujavolox.pdfIn PDF document text
    • http://files.redcouchreading.com/uploads/1/3/1/4/131437457/wigowiniwugunuret.pdfIn PDF document text
    • http://files.carolynnewilcox.com/uploads/1/3/1/3/131380288/jexijusaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1625/5645/files/bioavailability_and_bioequivalence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/english_vocabulary_in_use_upper_intermediate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/bogogiperotifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4756/7003/files/all_spider_man_comics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7936/8858/files/zikunidesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/6303757176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2742/2632/files/xezivubodedotobapugegubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/sumunepipom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/wiwojon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7572/1633/files/30350331505.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_off000091d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D5 5084 bytes
SHA-256: 5465fb692ca0336b7755b52f3fdcbaf5758bb346e5e4abfae1a23f1b654741f9
font_01_sfnt_off0000a32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA32E 9564 bytes
SHA-256: 5e5e2d0ecd8e82c5c9485bde69be1a2b355c22fd053547596d6bda738480532b

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