Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c717337853f2f91…

MALICIOUS

PDF

41.1 KB Created: 2020-08-02 13:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35af823684f085cb416f914dcaf2a5ac SHA-1: 6ba4e27ddded80e5d95029d66498e13149bf66e3 SHA-256: 7c717337853f2f914452e10620e1b721a62eb7bc3974409217b54c4f53cf9862
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, forming a link farm, with one URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to lure users to malicious infrastructure. No scripts were extracted, but the overall structure points to a phishing or redirection attempt.

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/pify?keyword=7+days+to+die+nitrate+powder
    • http://files.kochtaxidermy.com/uploads/1/3/1/8/131856188/a6a4c2b121f.pdf
    • http://files.smithandgoodson.com/uploads/1/3/1/4/131452846/3826353.pdf
    • http://files.rbeauchampgallery.com/uploads/1/3/1/3/131382092/mumilolitimewafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/20869909316.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/gogotumibatale.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/bootstrap_transition_js.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/51141385487.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7057/files/pudubozesidomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/78986249290.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/sulomifim.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/php_get_memory_usage.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/faguwasatewugekumabilazen.pdf
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/97669653291.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/96673597925.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/jedejimezifelubore.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_off000063a0.bin
137647d08e3e53d41a33b9db71257edc16236bba4b3b6c69e682abc2d7d84b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 5100 bytes
font_01_sfnt_off00007520.bin
37877dfca96b733634a052157cb909d79ef88123d18bdc7023b6fc0543cc83b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 10120 bytes