Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe397845a90c901…

MALICIOUS

PDF

46.7 KB Created: 2020-07-27 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06710cc9705e73d97e0205c3cb123f40 SHA-1: 4d81c4d6c82c2f53f0bf2d678b59036012de7d80 SHA-256: 7fe397845a90c90121ef78b236b57f489f9294d4c33b6debddd934dac6124df7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a lure related to a "CV template for teachers job" and embeds multiple external links. One of these links, https://ttraff.cc/pify?keyword=cv+template+for+teachers+job, is identified as a malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or improve SEO for malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=cv+template+for+teachers+job
    • http://files.kristintippingillustration.com/uploads/1/3/1/4/131483184/sonipo_sivukixetuduti_nilunujexi_nusanap.pdf
    • http://files.krwoodworkings.com/uploads/1/3/1/8/131871894/1591208.pdf
    • http://files.stephenskitchenandcatering.com/uploads/1/3/1/6/131606280/ba43ca8360.pdf
    • http://files.talsegevphotos.com/uploads/1/3/1/1/131164046/4664459.pdf
    • http://files.jenniferseasonsbooks.com/uploads/1/3/1/8/131858540/3396266.pdf
    • http://files.stephenskitchenandcatering.com/uploads/1/3/1/6
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/44029051316.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/57634362236.pdf
    • https://cdn.shopify.com/s/files/1/0433/9449/8709/files/59195949257.pdf
    • https://cdn.shopify.com/s/files/1/0434/7140/5222/files/56440973571.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/34582426685.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/vikaduxojuwebuvixe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/vazidotuwigawanefewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/gikivigejozagivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/numobirenemipubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/makinisozikisofezup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/giwekokexipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3256/8220/files/wubezafukimuvu.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_off00007928.bin
b548866a672ede28bc70d772c3859a410c89ecce09f22da99785faf282a6628d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7928 5188 bytes
font_01_sfnt_off00008ade.bin
46fc605a2a3014bd207d434b8570f5d3161c02404ccbf002232772d346add9ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADE 10292 bytes