Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea52d1a2a39f926b…

MALICIOUS

PDF

101.5 KB Created: 2020-08-19 20:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaea7e7c18f3adc5a83bd1cab110144c SHA-1: c09b171bf4084ee551a1f9cf1677565cd25f8a1d SHA-256: ea52d1a2a39f926b743f5eb9a6ea56523c81282c4a79b38a509d85b35715cf19
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The embedded URL points to a redirector service that uses keywords from the document body, suggesting a lure to trick users into clicking. The ML classifier also strongly indicated maliciousness. The document body itself contains garbled text but includes the target URL and a reference to 'Amcas applicant guide 2019', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=amcas+applicant+guide+2019
    • http://files.theartfulclarke.com/uploads/1/3/1/4/131407315/nopafun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/kuvimojekonugosoduwogu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/grammatical_categories_and_word_classes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/fipem.pdf
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/57678327641.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/sap_basis_documents.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/kapusuzujorowami.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/gimamesediriniwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0266/files/zonajijuwuje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/english_bible_niv_free_download.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_off000146bb.bin
2f7f60dfabc02dedb37fee2a405ea7e98c9736247ed7543c1c2b141c72dc9136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146BB 5768 bytes
font_01_sfnt_off00015a45.bin
6686e578a98bb2c6b114330d05294bb58696c9608102ca563b19da9edb0ab7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A45 15404 bytes

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