Malicious PDF — malware analysis report

Static analysis result for SHA-256 736346a201fe864f…

MALICIOUS

PDF

38.5 KB Created: 2020-07-27 01:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d35a7be1cbb89ccd804a65aa85fe9a6 SHA-1: 7c725e1d6d06b6e8d9359ebe0264c20246443d32 SHA-256: 736346a201fe864f092c98c395e4990beb2803359c280e1ea2969fb546ac8deb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of a malicious redirector suggests a phishing or spamming campaign. No scripts were extracted from this sample.

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=lagu+goodbye+day+ost+bridal+mask
    • http://files.deeperstillmissions.com/uploads/1/3/1/0/131069860/reropako_zavaserexu.pdf
    • http://files.arceasternpanhandle.org/uploads/1/3/2/6/132680932/xelape.pdf
    • http://files.jasonspitzer.org/uploads/1/3/2/7/132740814/d18f4f8.pdf
    • http://files.stjohnlutheransherburn.org/uploads/1/3/1/3/131384335/nigaxurixumuzirekixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/xovopebakigubikas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/sarusadixojifetevupelipid.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/17909984751.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/lilenis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/61888783357.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/levekod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/sesatekafepaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/nojabilexijedubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/rewaxonoladudizetexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3949/7112/files/85518538181.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/kuladevalogalapeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/80354684494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/30763246476.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596b.bin
7ff167135d1e71eac0f6965335e5186482699433739ad302291d199de3e4f4c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596B 5168 bytes
font_01_sfnt_off00006b0a.bin
4c696c824d4581a05ac8c3d79ec33cbd9c2992e67f30c11457006ba5968665d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0A 10068 bytes

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