Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab385fb2d29c619…

MALICIOUS

PDF

53.2 KB Created: 2020-08-09 16:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f804cae0d218020e13d0ed3a82b2c740 SHA-1: ce879c3da9de125cea4df4ce662a956010876215 SHA-256: eab385fb2d29c619bd69d78b186ed2e72261f3407d432d966cd4d200d93ff596
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=gastritis+erosiva+pdf', indicating a likely phishing or redirection attempt. The presence of numerous links to Shopify domains suggests a link farm used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=gastritis+erosiva+pdf
    • http://wigopi.marleekatz.com/uploads/1/3/0/7/130775169/sixekiperofo_wopesibazamobe_tuzot_zemudan.pdf
    • http://files.newkitchensplus.net/uploads/1/3/2/6/132682723/6883310.pdf
    • http://files.infinite-ensemble.com/uploads/1/3/0/7/130739275/rirufulotefidagij.pdf
    • http://kijulerix.support4sdrwales.org.uk/uploads/1/3/1/3/131398140/fepukubinavawator.pdf
    • http://files.asahionline.com/uploads/1/3/0/7/130739783/46b75a1.pdf
    • http://files.as
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/1710884407.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/gigepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/jexolabonofikezanejadoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/56464270376.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/12520848881.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/gebukas.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/58823122261.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/xosufujulofomev.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/77101847482.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/how_to_install_udeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/45700101042.pdf
    • https://cdn.shopify.com/s/files/1/0439/0633/4888/files/naxixe.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_off000093a1.bin
8bc60605e4519b66ea9f16352bb4e27f03dd3a0ace8356fc35c3a97be5144557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A1 5092 bytes
font_01_sfnt_off0000a50e.bin
a07e79fd41b7a116b8d2ad72bec043367e96dc8685c865706d796ade63d84fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50E 10188 bytes

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