Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab3554220a45334…

MALICIOUS

PDF

34.6 KB Created: 2020-08-09 06:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31525dfee956674cc35794afc189df79 SHA-1: 4195a3b486740226a78f42f6bf7b2d334402305e SHA-256: 9ab3554220a4533424e600382ddce52f0b26de605374e463eb40a2adfd786224
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=the+ant+and+the+elephant+pdf+download', which is also flagged as a malicious redirector. This suggests the primary purpose is to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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=the+ant+and+the+elephant+pdf+download
    • http://files.paragonsubro.com/uploads/1/3/1/4/131437242/3805896.pdf
    • http://files.tealpublishing.com/uploads/1/3/0/8/130873717/3565e85b2fca9.pdf
    • http://sizuveko.alotoacademy.com/uploads/1/3/0/7/130738799/saxorularuz-sejaxemixuve-zapowodumokok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/zuxavunumadapewewebowar.pdf
    • https://cdn.shopify.com/s/files/1/0439/5368/4638/files/good_email_writing_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/72412355661.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/92242710449.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/79675314529.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/16887412861.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/15440459562.pdf
    • https://cdn.shopify.com/s/files/1/0436/0706/4734/files/text_to_speech_reader_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/suziraliwafisiwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/ruzuvugetakoviwuzedolip.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/11739507840.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/8600112390.pdf
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/26989074790.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_off00004d0a.bin
5ed97da9a2ba5c1f9bffa2c85a6ffe784923aae431501c37de9a3819ab6adbdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0A 4896 bytes
font_01_sfnt_off00005dc7.bin
84df461411eae4dc88e1ffef89aec7808127f31d5b576017392fa8547013adc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC7 9260 bytes