Malicious PDF — malware analysis report

Static analysis result for SHA-256 503e5bdf9b1be520…

MALICIOUS

PDF

39.7 KB Created: 2020-08-20 18:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00634be05135e1baf17c3622afacc516 SHA-1: b7c76dcfc41cf2b9de84ba9a9b6745d234ef0603 SHA-256: 503e5bdf9b1be5204d13be82a2c0e1eddb771feaee818f711ad89a3850f7d1aa
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers this heuristic. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document, likely intended to redirect users to a phishing or malware distribution site.

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=manufactura+con+materiales+compuestos+pdf
    • http://files.tnhempseed.com/uploads/1/3/1/4/131407445/e7c85153.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/30835727235.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/vigotevokinitolewikejepil.pdf
    • https://cdn.shopify.com/s/files/1/0447/9424/9377/files/air_pollution_effects.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/3ds._cia_files.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/11831444869.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/wixorolowazat.pdf
    • https://cdn.shopify.com/s/files/1/0433/8748/6358/files/56382371067.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/46225519176.pdf
    • https://cdn.shopify.com/s/files/1/0457/6690/1924/files/total_war_warhammer_bretonnia_building_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/8583/9003/files/believe_in_yourself_book_download.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_off00005b23.bin
0183918d3652684685404d63e5b1536dca5c178d2f0357d1cda7a14aa8d12a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B23 5304 bytes
font_01_sfnt_off00006d17.bin
58b44a45cb8c29edf1436e118739a0a6028e7bb47522f3932412b73414af90fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D17 10824 bytes

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