Malicious PDF — malware analysis report

Static analysis result for SHA-256 531e3290003a70b7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-05 05:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9134cad80372768ab1abff659ea7800 SHA-1: f87f9e5ba19ddadb4fa4925e6efdf6a9e24de8f5 SHA-256: 531e3290003a70b74fa2eae999873a6be1f514cc6972317ebd88bd966b60ab2f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=the+usefulness+of+useless+knowledge+pdf+download'. This URL is designed to lure users into downloading a PDF by disguising the malicious intent. The document also contains a PDF link farm heuristic, indicating a large number of external links, many of which point to Shopify domains, likely for SEO manipulation to increase visibility. The ML classifier strongly supports the malicious verdict.

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=the+usefulness+of+useless+knowledge+pdf+download
    • http://puwigus.shopthornburyfromagerie.com/uploads/1/3/1/3/131398091/visetiruwita.pdf
    • http://files.jordanbc.org/uploads/1/3/0/7/130740249/0475c81eb2bb5.pdf
    • http://files.cdl-canberra-ec.com/uploads/1/3/1/4/131406843/pukurajagefapu_xamuwos_togomisojor.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/webufesekulagedab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1885/files/kagakufev.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/97597337830.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/vibexeri.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4702/files/xedigezawifopemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/how_to_disable_ansel.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8723/files/anaphylaxis_action_plan_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9016/5403/files/20137185278.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/94716720738.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/petidexuzexubisufemavat.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/pokibanepudibapilugupuwiv.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_off000063b1.bin
7b2ad5d735cfd1e58571ac0d4f17fdf5ea17fd693fb8d0bf0e9a522e5ede6f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B1 5312 bytes
font_01_sfnt_off000075de.bin
f44c6d25c1d0a5407dd820f2270bc785cac591fcc251d1d304853bc476c2d04e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DE 10748 bytes

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