Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d62a304ff447920…

MALICIOUS

PDF

46.0 KB Created: 2020-07-31 00:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1f2a7bb7cc467c8e3c29caafb11fc14 SHA-1: 4ec294e6d845899ad013c8cc8b9e3430782f5e7a SHA-256: 9d62a304ff4479208713eb8a1de4500d07198d60fbe8922be5edea78fcaf2e7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Sam Harris free will pdf'. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The primary attack vector appears to be directing users to a malicious redirector.

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/wb?keyword=sam%20harris%20free%20will%20pdf
    • http://files.atdesignpartners.com/uploads/1/3/1/4/131437487/62a3fc4d7.pdf
    • http://files.jeanfahmy.com/uploads/1/3/1/4/131407767/xulodotal-mezado-zazupifojo-sogutunujax.pdf
    • http://files.stettlercarclub.com/uploads/1/3/0/7/130738779/konoju.pdf
    • http://files.christchurchjax.net/uploads/1/3/0/7/130776401/55d284.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9828/3940/files/10905556044.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/36492708678.pdf
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/junubafokudukapimosule.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/getob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/85326329726.pdf
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/79376809595.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/pibawoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/4405/2898/files/fudarexojosenejosar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/50616847787.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/68656564923.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovaratumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/zuxipoxanu.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_off00007754.bin
e880ea4e23e2e3bb99767011df7b4243755b382992ec9ec73a60fe6f48946905
pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 4968 bytes
font_01_sfnt_off00008838.bin
b8e09b8646feca4f5499ab5a2caf4e3518447bb97dc2404b17315f8e46faea6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8838 10244 bytes