Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8539a8f5500d318…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 13:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdf34ba953207c379cbd8ec34907567e SHA-1: 8b123cccb0e6c5ea671bb7654785340873a811c0 SHA-256: a8539a8f5500d318f9a300bd6150edb0fcc9d61c3227115be8037a7233aa27ac
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 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'guide michelin alsace 2019', suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.com/pify?keyword=guide+michelin+alsace+2019
    • http://files.peepsnpaws.com/uploads/1/3/0/7/130776542/xidiwubogizebubu.pdf
    • http://files.safepassagesandprose.com/uploads/1/3/2/6/132681325/7865488.pdf
    • http://wemofexaw.artbyguyyoung.com/uploads/1/3/1/6/131606055/6599157.pdf
    • http://fatuz.christiangreenlmt.com/uploads/1/3/2/6/132680981/5244080.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6343/files/28913613804.pdf
    • https://cdn.shopify.com/s/files/1/0447/7173/7749/files/capas_de_la_atmosfera_y_sus_funciones.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/bulandshahr_news_app.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vunususojorimit.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/digital_principles_and_design_givone.pdf
    • https://cdn.shopify.com/s/files/1/0431/2825/8726/files/aneurisma_de_aorta_abdominal_infrarrenal.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/zugejabatubimujajusawe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/68508468509.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/81294973919.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5832/files/doxovusinato.pdf
    • https://cdn.shopify.com/s/files/1/0435/4274/1143/files/nomenclature_of_aldehyde_and_ketone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b32.bin
f1d61a288000be0af1161c1797022ed1dc787664adcda85367e4ee3e982db807
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B32 5288 bytes
font_01_sfnt_off00006cf9.bin
9d61e249500c11070d15325eb6c43735941244120e2b34fa00db903fab667a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF9 15460 bytes
font_02_sfnt_off00009cbc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBC 4324 bytes