Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9af03d80cf89e…

MALICIOUS

PDF

32.9 KB Created: 2020-08-01 02:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e19a2c54ef9b68afb66e350341a1da18 SHA-1: 2087b7fca6fbdeb684b7fc91b3e23df439fe0fb3 SHA-256: 40a9af03d80cf89e495d8e9c958324ae333815179446df1d86778010e3ffe8bf
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, primarily hosted on Shopify. One of these links points to a known malicious redirector. This suggests a link farm or SEO poisoning attack, where the goal is to manipulate search results or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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=iris+sleeping+with+sirens
    • http://files.cavalierclubvictoria.com/uploads/1/3/1/4/131437660/numurilezupolatas.pdf
    • http://files.partoencasamujeressabias.com/uploads/1/3/1/4/131453867/dozobelaperisus_petipovanax_samuwutepina.pdf
    • http://files.sparklemobilevaleting.com/uploads/1/3/0/9/130969695/1099847.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/86672495736.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/givinir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/rebigawamudod.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/8398592411.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/dixuroxinekofozovim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/94436769626.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/30672817893.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/yz250_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/4136946148.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/64291511402.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/28850891897.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_off0000464e.bin
806d2147a26687c7613479b4dfbe8710b3467a05cc01fe97cef3d53f7f833e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x464E 4900 bytes
font_01_sfnt_off00005709.bin
3d75028df1ec2367ac424ef85dd07b1408239656f2234a8b19eec3c91c8d65e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5709 9400 bytes