Malicious PDF — malware analysis report

Static analysis result for SHA-256 0771ae87fc5deb08…

MALICIOUS

PDF

38.7 KB Created: 2020-07-09 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb820f49c2efc330bf4963ead059aa88 SHA-1: 7af3fce7e593c975cc25f7e088cd8153c44b1aaa SHA-256: 0771ae87fc5deb0859f6d77c00aaa01f6d5a2bc95de9dd4a309e984b60707bd9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector and a large number of other PDF files, suggesting a link farm or SEO abuse tactic. The primary lure is a 'rubik cube solution pdf download' to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a campaign to drive traffic or distribute further malicious content.

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=rubik%20cube%20solution%20pdf%20download
    • http://files.justjig.com/uploads/1/3/1/3/131398253/05fa5.pdf
    • http://files.lauraswinkfineart.com/uploads/1/3/0/9/130969553/nadogawu.pdf
    • http://files.extremeglamhair.com/uploads/1/3/2/6/132695273/37792b92ec.pdf
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/0/7/130739747/vunidegote.pdf
    • http://files.poehaku.com/uploads/1/3/1/6/131607239/ab7f23f.pdf
    • http://files.strategieswork.com/uploads/1/3/1/4/131454304/0395b4b5c.pdf
    • http://files.anindodeyphotography.com/uploads/1/3/0/9/130969514/631f07bd72fe5.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://files.frenchkidz.com/uploads/1/3/1/6/131606201/1b03cbad6ca546.pdf
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.ksweducationalconcepts.com/uploads/1/3/0/7/130775603/6264739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xelibexe.files.wordpress.com/2020/06/rinipomupodizududib.pdf
    • https://botemep98974298.files.wordpress.com/2020/06/dudof.pdf
    • https://fexoposikin.files.wordpress.com/2020/07/96856811998.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93867881616.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19490865332.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_off0000590e.bin
24da516dec2a00c204c55319d5943f903e4bb13bafc6eeeac923b08313898244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590E 5236 bytes
font_01_sfnt_off00006afc.bin
44fd8e26097498168663c8d560d04cd3a44b04175739d39383119e5fe247ffc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFC 10088 bytes

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