Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ae7173e723190b…

MALICIOUS

PDF

48.2 KB Created: 2020-08-12 00:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27f0bf44287d69ad076b466ab315521 SHA-1: 3f41da49ec693c4d00cb0cc9f71972cc2d44ab29 SHA-256: 36ae7173e723190bee9e323b90b20509397f4bfcc43d0155bb11e5a57202e60e
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs, a technique often used for SEO poisoning or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=fases+de+la+apoptosis+celular+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and several Shopify-hosted PDF links, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=fases+de+la+apoptosis+celular+pdf
    • http://files.maximiliangoetz.com/uploads/1/3/1/3/131380606/wogatotivokobe_bewukubi_bijejeb.pdf
    • http://zosetusa.apragp.org/uploads/1/3/0/7/130738836/zematasimigawabov.pdf
    • http://gepemo.freemarissanow.org/uploads/1/3/0/9/130969945/521682.pdf
    • http://piligoji.somethingforsam.com/uploads/1/3/2/7/132710507/pazuguzubi-gawit.pdf
    • http://files.stephenhayesdressage.com/uploads/1/3/0/9/130969775/92e6ec.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/vaxuluxiboxut.pdf
    • https://cdn.shopify.com/s/files/1/0429/5360/5273/files/88359970670.pdf
    • https://cdn.shopify.com/s/files/1/0431/9192/6948/files/algebraic_expression_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/69464532477.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/vewudugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/bavugepojope.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/53093159352.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/zugojigabijinodevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/regajedixudimapalusube.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/bamudebirikuziwix.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/tubudixokuzu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8042/3326/files/57844381758.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_off00007b22.bin
ce8745a150daf1ddc7b5099498d0b92b91d7c8dbdd15eb4798f11bf55802e088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B22 5104 bytes
font_01_sfnt_off00008c8e.bin
c95d0c97396b51ea36ba31ad72f085b969e6eb61853589eab9d7996827c5cf81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8E 11680 bytes

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