Malicious PDF — malware analysis report

Static analysis result for SHA-256 079838bd4be64b6d…

MALICIOUS

PDF

63.3 KB Created: 2020-07-22 10:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42616012f21272727cb9c665303de07e SHA-1: b5cbc07a74eb569929021bd673e72bc62ccc7f13 SHA-256: 079838bd4be64b6d9cf0412d64ea66834c5aa9612a5e75088ee9af6e69f870ec
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, suggests a lure related to downloading a 'chemistry textbook'. The presence of many external PDF links further supports a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=chemistry+textbook+for+senior+secondary+school+pdf+download
    • http://files.knowledgescroll.com/uploads/1/3/1/6/131606060/4056c643f62.pdf
    • http://files.carnewhistoricalsociety.com/uploads/1/3/1/1/131164310/b3c34.pdf
    • http://files.christianmemoirs.com/uploads/1/3/0/8/130814169/29e9f73f79.pdf
    • http://files.cadecim.com/uploads/1/3/2/6/132680986/bovelolebiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8388/1893/files/podakesurevifediruvunuto.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/4106864177.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/dudesiweluxetofunugil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/sizalozafuba.pdf
    • https://jajesoke.files.wordpress.com/2020/07/22244211500.pdf
    • https://dadufot.files.wordpress.com/2020/07/83345974841.pdf
    • https://litosem.files.wordpress.com/2020/07/6530981993.pdf
    • https://zonutebeva.files.wordpress.com/2020/07/zaxejezegafex.pdf
    • https://milinubed.files.wordpress.com/2020/07/36537066379.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/1719910052.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/52414479055.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/vuwisubupumekixipopavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87913440599.pdf
    • https://cdn.shopify.com/s/files/1/0429/2257/3990/files/90223503859.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/88709777062.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/nidumeromezis.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_off0000b472.bin
3c92ff6b0aaf768c8fbe99af0e40bc3486a35cf7431193c7ac181477133cf3ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 5672 bytes
font_01_sfnt_off0000c7a7.bin
b845df44954ad25f2d1923126de77b0cee6948480c35c5e03f7a46cd9e42e016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 11504 bytes

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