Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc734d52bfba31f…

MALICIOUS

PDF

49.6 KB Created: 2020-07-18 01:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66a8083447d2a832736399c8de2fffb SHA-1: 656ad18d5ec9f2b81184e724ce3cc6e74e7fb27e SHA-256: 0dc734d52bfba31f4a01d834d278ecf0857a53a3d1bdf5ad69f812e53e57586b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, indicating a potential distribution point for further malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest malicious intent, likely related to driving traffic to malicious 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=jacob%20grimm%20teutonic%20mythology%20pdf
    • http://files.kmccreations.com.au/uploads/1/3/1/4/131453724/817ad733.pdf
    • http://files.glencoeflorist.co.uk/uploads/1/3/1/8/131856276/nigijulozivedup.pdf
    • http://files.markmirabello.com/uploads/1/3/1/6/131636772/buxafirulipusu.pdf
    • http://files.versatile.pub/uploads/1/3/0/7/130775001/0e676d.pdf
    • http://files.davisranchi.com/uploads/1/3/1/3/131380870/potipiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://megaxosu.files.wordpress.com/2020/06/wekavadavedagiz.pdf
    • https://tamufewa.files.wordpress.com/2020/07/wutonujoba.pdf
    • https://nuluxanetud669327104.files.wordpress.com/2020/07/41228547822.pdf
    • https://mewalijovil.files.wordpress.com/2020/06/busevojirimesagomu.pdf
    • https://vogupiboje.files.wordpress.com/2020/06/97221209829.pdf
    • https://wetejog.files.wordpress.com/2020/07/21326896829.pdf
    • https://lewarakorin.files.wordpress.com/2020/06/pubabizevesibojotu.pdf
    • https://jikaxeludaja.files.wordpress.com/2020/07/lexolawozo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/78819802283.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/wikoxejed.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/legugadivitupikogijibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/14463815547.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/33578183890.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/voduranujarunevulabinutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/66275391960.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3336/files/konagopikazowune.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_off00008234.bin
97ae2981923385fd799062e1d2c74e52710af169401f2da91acb4cdb15791cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8234 5504 bytes
font_01_sfnt_off000094b6.bin
8cdc715a9a6a08a200a3e06b561f2c1ddbc05b134090b1c9507aa11f29b775bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B6 10904 bytes

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