Malicious PDF — malware analysis report

Static analysis result for SHA-256 934411c871db8007…

MALICIOUS

PDF

67.5 KB Created: 2020-07-08 18:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e58ec84e8f4596804aca437baae188b1 SHA-1: 6b62b113f6bf3af1d9e47d09d2a8f133ab85701b SHA-256: 934411c871db8007cee0b75d3da4ed2ada0aad684aab06962c789b58e11cd844
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains designed to host downloadable files. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The ML classifier strongly indicated maliciousness. The embedded links likely serve to distribute further malware or lead users to phishing sites.

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/wb?keyword=joint%20variation%20worksheet%20pdf
    • http://files.royalecare-afc.com/uploads/1/3/0/8/130873849/paraduj_fizodifo.pdf
    • http://files.lkoc.org/uploads/1/3/1/3/131383497/bofepowoj.pdf
    • http://files.nelsonnieves.com/uploads/1/3/1/3/131398367/mujasofugeromax.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.35ewc.com/uploads/1/3/2/6/132682290/zisomuzusam_jukuxel_kefufamasuxax_zowumokelow.pdf
    • http://files.hikaricreative.net/uploads/1/3/0/7/130739764/8723732.pdf
    • http://files.cupelocal748.com/uploads/1/3/1/3/131398250/sujutitel_xuwelamirur_fedogabafisuk.pdf
    • http://files.chrischiropracticservices.com/uploads/1/3/1/4/131437753/2163686.pdf
    • http://files.jilliancanavan.com/uploads/1/3/0/7/130776003/6623952.pdf
    • http://files.mnnicebaseball.com/uploads/1/3/0/8/130874458/xamezut.pdf
    • https://fusikazisome.files.wordpress.com/2020/06/zemikopuwoginitonug.pdf
    • https://sivitaxip.files.wordpress.com/2020/06/xegotosugusuvakaleza.pdf
    • https://polagigeso.files.wordpress.com/2020/06/fimizujofiwap.pdf
    • https://suxeniruwip.files.wordpress.com/2020/06/96372865543.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigef

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b603.bin
03196ecf4edc7b87e0a33c41e88865dd9bae651288151e4bdaee6e147c65ef3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 5092 bytes
font_01_sfnt_off0000c754.bin
ea10ac11888e4c3a17eadae41f90357bc42b38d0373901c6a6c174c4234cab70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 2052 bytes
font_02_sfnt_off0000d008.bin
4573804fd0f19cebca6e7bbd9d0e91940975fec74e74c721561602f67f0a8416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 15500 bytes

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