Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b25dc8282ff22b5…

MALICIOUS

PDF

51.3 KB Created: 2020-08-03 05:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb9a39899ea10ae575789b4371f04b11 SHA-1: 2f8b2af70d844d743cf17f1c12886a4134982841 SHA-256: 7b25dc8282ff22b54303ee26d8c5ed266c6874a4a1fca7dd941ed64aa355ed1e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm hosted on Shopify. One prominent link, 'https://ttraff.com/pify?keyword=blitzer+college+algebra+pdf', is flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=blitzer+college+algebra+pdf
    • http://files.kristindahlhomeloans.com/uploads/1/3/2/6/132695668/ziwituwesuxofiruf.pdf
    • http://files.steepyourcuriositea.ca/uploads/1/3/0/7/130775223/vilisal.pdf
    • http://files.rmmfoundation.org/uploads/1/3/1/3/131379971/mudugu.pdf
    • http://files.carolinamunozparra.com/uploads/1/3/1/8/131856173/34d2f38d451.pdf
    • http://files.annekawalker.com/uploads/1/3/2/7/132740352/sadixiva-vuzaxeri-gipowo-liwaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/70674390118.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/zijigajitetel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/84516825556.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/43512179021.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3152232763.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/megetik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/87141767125.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/71929045918.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5873/files/suvenovevowejevibagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/45096709022.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/dinonazaru.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/south_lomei_labyrinth.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a03.bin
bef78895009178a9e924030aa4f20e06d6c0176beba9ce2d5a772ac041ec329c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A03 5384 bytes
font_01_sfnt_off00009c6a.bin
9595f9f0956292e6a9cadf40de624696338506925a1938d69fa6fb0ed0c0a3ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6A 10724 bytes