Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b812e36ccf25d1…

MALICIOUS

PDF

43.9 KB Created: 2020-08-25 04:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b48ceb413eeaaae637ea3065bbabfb SHA-1: 70e6973f68d8280857d53503433f3a558e08e573 SHA-256: a3b812e36ccf25d133a33d1ca49e35e8f0f7408f95e5548f1b8425e3ab8ed4bc
150 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=template+website+bootstrap+news, which is also listed as a known malicious redirector. Additionally, the PDF contains a mass external PDF link farm, with 30 links pointing to various Shopify domains, likely for SEO manipulation or to host further malicious content. The primary attack pattern appears to be the distribution of malicious links disguised within a PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=template+website+bootstrap+news
    • http://levaf.definitivearts.net/uploads/1/3/2/6/132680981/fezujijuziwaxuz-jidajepisarira-fawij-xowitamenako.pdf
    • http://files.alvinmark.com/uploads/1/3/0/7/130738914/moramuporewemif-pakevur.pdf
    • http://ginolakev.marissahonda.com/uploads/1/3/1/6/131607095/nabijugu-putijek-zoros-vituwixo.pdf
    • http://tovis.tillylunken.com/uploads/1/3/0/8/130814340/fakora_netaxojoxuzak_lidowoz.pdf
    • http://files.themonkeysbanana.com/uploads/1/3/1/4/131453267/lofudituwut_lapazebo_wisajatesupo_jowiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/debovepenajiwesubeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/72937103387.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/sobemalivozuwupijumut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/76522476404.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/seeley_s_human_anatomy_and_physiology_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/sony_strde_197.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/a_cruel_angel_s_thesis_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0439/9710/2238/files/likurifofir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3590/files/deep_learning_autoencoder.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/google_academico_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/embedded_linux_booting_process.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/22576426279.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/80284673941.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_off00006fe6.bin
24337aea6f50e4214b92ec0e15d2baaa6d6ccc8c0bdf45699aaa4a51fcef4393
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE6 5148 bytes
font_01_sfnt_off00008159.bin
b0f2cd3303ce408d25f83900b32a9a79260382296f050dd99413a9f4e473820b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8159 9632 bytes