Malicious PDF — malware analysis report

Static analysis result for SHA-256 519f4c1fb8e78870…

MALICIOUS

PDF

59.2 KB Created: 2020-08-11 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b82b33a7a53bcf4fcff729122616506 SHA-1: c127b12aa83a3ff17a1d9f17305ebabf1c5e9fee SHA-256: 519f4c1fb8e78870f7b158c10a22d787336656db2790456c84225708a7561b90
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=beware+of+the+dog+dahl+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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=beware+of+the+dog+dahl+pdf
    • http://files.variantspaceblog.com/uploads/1/3/1/4/131407767/nonudewalet-weferipunude-wobid-julafolusama.pdf
    • http://files.drissmanlaw.com/uploads/1/3/0/9/130969562/6102062.pdf
    • http://xizugafo.wahunsenakah.org/uploads/1/3/0/7/130738732/rejib_vipepenijo_fujafiju_zavefovevaxemi.pdf
    • https://cdn.shopify.com/s/files/1/0450/0904/3606/files/understanding_pathophysiology_huether.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/91380343007.pdf
    • https://cdn.shopify.com/s/files/1/0431/2675/1389/files/49327914124.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/52047608382.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/zeidler_nonlinear_functional_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/nbc_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/89062737770.pdf
    • https://cdn.shopify.com/s/files/1/0435/4356/0351/files/caltrans_traffic_safety_systems_guidance.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/bapupepavilosofubanof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/15823384250.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/after_the_fall_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/movuzejutagadolobixosuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/walden_la_vida_en_los_bosques_henry_david_thoreau.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_off0000a9e4.bin
dba0a95eb5ca1f0d13700d11a232d4a56286fab6bd60a1f2ee0ea30c95597e51
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E4 5264 bytes
font_01_sfnt_off0000bbdc.bin
bc764a10eb6a9e789b3fc6353337bd2c2f096a5f4f5f4d7b4319a756f6e7fc03
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDC 10404 bytes