Malicious PDF — malware analysis report

Static analysis result for SHA-256 5591beaf9447c0cd…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 02:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf9e0b7c55c55dff449f1c68b2f5498a SHA-1: 25f76e600b02fa918134918c86cbdd395de7e4cf SHA-256: 5591beaf9447c0cd063d7e2e8c8d739ca62711a284ba9dcff3d9bbb3b2dbcb4e
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to a large number of external PDFs, likely for SEO manipulation or to distribute malicious content. The primary malicious IOC is the redirector URL.

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=formula+of+ms+excel+2020+with+example+pdf
    • http://files.norcalstma.org/uploads/1/3/0/9/130969705/6742202.pdf
    • http://files.the-osg.org/uploads/1/3/2/8/132815054/semevoxizur.pdf
    • http://files.maninthemoonpub.com/uploads/1/3/2/7/132740547/keforibup.pdf
    • http://vuwup.wintergreenmapleproducts.com/uploads/1/3/1/4/131453134/f9204770e39.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/86588194509.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/givabij.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/cgp_functional_skills_maths_level_2.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/84585462512.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/fulagekumusivexirokul.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/nremt_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/kadanafanirirekerikipol.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/91505913387.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/better_english_pronunciation_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/career_survey.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/12100801842.pdf
    • https://cdn.shopify.com/s/files/1/0432/0673/8079/files/2008_ap_calculus_ab_free_response.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_off00006866.bin
db567d93c5d0cd70612eb3e3718a0714dd93705d1b87ebee695e06ff2639741a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6866 5784 bytes
font_01_sfnt_off00007c0e.bin
aa3d82d49558c29ccd057bc965eba297cc5742cb0794159ca56f50fb9942aff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0E 10784 bytes

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