Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10c1cb978002e66…

MALICIOUS

PDF

38.2 KB Created: 2020-08-01 16:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c33e12e7d13b3162e66ae63bfcd3828d SHA-1: 715d9261da55192a266b428d86bc0e4d0b329a99 SHA-256: f10c1cb978002e66dcad730f5abda29c9748dc3ad94bcbba95604f8b9ddc220a
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning attack designed to lure users with seemingly legitimate book downloads. The primary malicious URL is https://ttraff.ru/pify?keyword=calculus+briggs+2nd+edition+pdf, which is flagged as a malicious redirector. 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.ru/pify?keyword=calculus+briggs+2nd+edition+pdf
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdf
    • http://files.trilogybookclub.com/uploads/1/3/2/7/132710743/ragijar.pdf
    • http://files.feelgoodkickass.com/uploads/1/3/1/4/131408970/5760969867f7.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/xedoxupawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/bloodborne_ritual_blood_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/sowovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/lilekobom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/liziroraxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/81078500231.pdf
    • https://cdn.shopify.com/s/files/1/0438/0445/9170/files/82241674809.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/fizavalegisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/kivinubukorefuzuluw.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/lewenafumivo.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_off00005700.bin
34c96567cecb9724a190a978343a46109e8dac28fc76a3782afe273981bf05cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5700 5500 bytes
font_01_sfnt_off000069b7.bin
25badec1801b4699aaf3c652da3a26dd0fdc85cf135613b71ca698075ce41588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B7 9980 bytes

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