Malicious PDF — malware analysis report

Static analysis result for SHA-256 08035e8c6c6ddb77…

MALICIOUS

PDF

39.2 KB Created: 2020-08-12 01:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2d3536e7abb7d4638b11d32708cfb5 SHA-1: 91f2d6cf663ab7c32c831b9b5097126df0601b5a SHA-256: 08035e8c6c6ddb772e36a46748d1295e3f02b2b41f764de86882057814805f96
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for 'Android studio tutorialspoint pdf download', which is then linked to a malicious redirector. The presence of numerous external PDF links also indicates a link farm strategy, likely for SEO poisoning or distributing malicious content.

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.cc/pify?keyword=android+studio+tutorialspoint+pdf+download
    • http://files.onelifeinhaiti.org/uploads/1/3/0/8/130813366/6661077.pdf
    • http://files.golfrcc.com/uploads/1/3/1/0/131070561/1876576.pdf
    • http://files.americaninspections.us/uploads/1/3/1/4/131453650/74a73a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/78997365035.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/3921776316.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/8533855642.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3804/files/valmiki_ramayanam_ayodhya_kanda_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/jiguzemiwozokukovomobe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/javascript_ajax_response.pdf
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/80549788603.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/fogagore.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9845/files/basic_counseling_skills_handout.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d56.bin
a12f7a9471a40fdfbd16db48406a8f79030f6ebe9f3a90ad2774b6fc4279fa0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D56 5116 bytes
font_01_sfnt_off00006edc.bin
4628360bd7ab8ebf3f8c65ee50a6dd294b825370b79482aa6585402dbcebb6dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDC 9824 bytes