Malicious PDF — malware analysis report

Static analysis result for SHA-256 e879963848c9c6f1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-08 11:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e17a33db6c107c9b4cab097d590631a9 SHA-1: 648684fa4347f5858555b9925dd573b9c6a910de SHA-256: e879963848c9c6f116c5307888a8a9bfaa61feb522567b7d1504850f83f43541
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=el+origen+del+budismo+pdf', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic 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.ru/pify?keyword=el+origen+del+budismo+pdf
    • http://files.orencostation.org/uploads/1/3/1/4/131437822/2660966.pdf
    • http://files.peninsulabiblechurch.com/uploads/1/3/2/3/132303378/a91886b5c5260.pdf
    • http://files.cambriacountycampcadet.org/uploads/1/3/1/4/131408024/tugeroguw-bemupisesiz-nusososodogo.pdf
    • http://wenotu.predatorecology.com/uploads/1/3/0/9/130969060/1898114.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/lajarekesomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/modo_marbel_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/data_acquisition_system_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2379/3308/files/gudokarutapadabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/37188111583.pdf
    • https://cdn.shopify.com/s/files/1/0440/1951/5557/files/60728027593.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/32875709098.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/sujam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/60854585538.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2959/files/91054429827.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/88599588914.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/22596397869.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/tasogaxebafumijipoje.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_off00006d67.bin
172926ef1b65e6f0178ba3abffcf19f59f55be30c26dd77dd92d278702108c32
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D67 5248 bytes
font_01_sfnt_off00007f2c.bin
354631e70c0237289baf0ff7a1cf5e392fa84ec337a32d78c80d83aae537ffb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2C 11128 bytes