Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad38182225c0d1c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-19 07:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df251b199715bf245c04d69b4de3e18e SHA-1: 20c81787eb52fad8c169fbbfe1a030090673d0a0 SHA-256: 4ad38182225c0d1c63c72b0e9cc1cd8df0998d77ce05b8bd7643a1d1ab88aec5
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous URLs, many of which point to benign content on cdn.shopify.com. However, one URL, https://ttraff.com/pify?keyword=acolia+causas+pdf, is identified as a malicious redirector. This suggests the PDF is designed to lure users into clicking malicious links, potentially leading to further compromise.

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/pify?keyword=acolia+causas+pdf
    • http://files.lindamkurth.com/uploads/1/3/2/8/132815298/lifud.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9558/files/vafinimite.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/jadasumetiwogogopugux.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/medejokonomapufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/rozeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/koury_guide_service.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/figakobofofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3836/6113/files/muscular_system_quiz_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/ruby_each_with_index.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/zijibewovufarejusa.pdf
    • https://cdn.shopify.com/s/files/1/0446/5954/0121/files/game_call_of_duty_3_ppsspp.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/dinuwozejizax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/bilamododuj.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_off00006ad5.bin
41eabbfbeaf5a71cb28682604af64476b117fce0dd8ccd983894af0e16e6a0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD5 5040 bytes
font_01_sfnt_off00007c0e.bin
6854cb7e9d9fd5bbeedef90623b323574d153c78a250bdde5840249ee5d32940
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0E 11476 bytes