Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8709950d37e96e…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 23:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfde3193e3fc305dbbdb8502956ac308 SHA-1: cfb7554a49eb71b32883ee85d6fb98c718d11786 SHA-256: 6c8709950d37e96e2d112a35ef5489cb76548d8b133b1bae2e4932cc16506a78
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 of which point to external PDF files hosted on Shopify. One of these links, however, directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text and embedded URLs suggest a lure to download more content, potentially leading to further malicious activity.

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.cc/pify?keyword=bruno+munari+design+as+art+pdf+download
    • http://xudabel.greyandscarlet.com/uploads/1/3/1/4/131452836/9a641ef66a.pdf
    • http://files.333-godsendtimesosministry.org/uploads/1/3/1/6/131636889/mimug-nipubavapoluzi-fotopakidu.pdf
    • http://files.aphroditeprojectbirth.com/uploads/1/3/1/0/131070485/xoxudinuwilalujexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/first_date_blink_182.pdf
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/wenutimov.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/68639948829.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/88361437926.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/dugafatamejejib.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/bojezurokim.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/zinedebowirinixopanew.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/pixavetelarewidexunufoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/dovujug.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/92899995862.pdf
    • https://cdn.shopify.com/s/files/1/0430/4194/7801/files/20201905411.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/rowepidawaduwibed.pdf
    • https://cdn.shopify.com/s/files/1/0438/2444/7638/files/29508752635.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_off00005db0.bin
fc3e0bdc017561f6eabb35fa62c3aa0c7f615065cdb35d358860a1b0569ea216
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 5504 bytes
font_01_sfnt_off00007067.bin
f848fa7f59e482c34f07c846bbccc91de7fbbefc74fd1308e9baa8843647b8c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7067 10556 bytes