Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c2e6af1d59b538…

MALICIOUS

PDF

42.6 KB Created: 2020-08-17 18:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c023d39fba7610512fa5f8307845535f SHA-1: 351219ffb92df1a236e43d52a5123c419a5334f2 SHA-256: 19c2e6af1d59b5380e692e90170bb9fe5ca15dc109004f4747df22118b2886db
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an error message about full internal storage, aiming to trick the user into clicking it. The link leads to 'https://ttraff.cc/pify?keyword=error+almacenamiento+interno+lleno+android', which is a known malicious redirector. The document also contains a large number of external PDF links, many hosted on Shopify, which is characteristic of SEO link farm abuse. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=error+almacenamiento+interno+lleno+android
    • http://kinujul.corhartselle.org/uploads/1/3/2/6/132681947/883779.pdf
    • http://files.gaventrinidadtheatre.com/uploads/1/3/2/6/132681294/nozunupaluzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/5539892125.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/25137179331.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/theory_of_harmony_arnold_schoenberg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/dadofifuveminik.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1181/files/nulisidezikexu.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/cgpolice_si_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/1623/1840/files/temperature_sensor_calibration_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/ruwugadefoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/jinonipiwetul.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/2101277930.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/73670762224.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/xadur.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/3837522233.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15074065918.pdf
    • https://cdn.shopify.com/s/files/1/0432/2453/1101/files/reading_comprehension_worksheets_with_answers.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_off00006868.bin
79124f7368ace2af054b674efaf1d1a7c854a1494a33baefe444b65fe5ad6912
pdf-font-stream PDF embedded font (sfnt) at offset 0x6868 4864 bytes
font_01_sfnt_off000078d2.bin
2cbe6329e7ece2a04e87e341616098feb48616a26fb69952b27e00e13c50400a
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 11144 bytes