Malicious PDF — malware analysis report

Static analysis result for SHA-256 e655a6a817afca8a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 17:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b821876da8ebee841bf5f79e182df66 SHA-1: 6520e6aa0a7c516029344ec6d7bf31964656e945 SHA-256: e655a6a817afca8abc559e6737e6189ca3c4e592f5ea5c25a6b4dba6dcb1669a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a liver function test report. The document also functions as a link farm, directing users to numerous other PDFs hosted on various domains. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL points to a phishing or malware distribution attempt.

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=liver+function+test+report+format
    • http://files.scituatehighschoolathletics.com/uploads/1/3/1/0/131071256/wuxoxazux.pdf
    • http://files.lostacresresort.com/uploads/1/3/2/8/132814898/kofubimebimadavumu.pdf
    • http://files.mindgility.co/uploads/1/3/0/9/130969002/fofixowoguxujereniwa.pdf
    • http://files.wrm-designs.com/uploads/1/3/0/8/130874143/b29c58e98731c1.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/verb_to_be_past_tense_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3873/files/80964707523.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/kagokipisezuvuzere.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/histology_of_kidney.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/5759901314.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/begusavasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1588/files/88542565269.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/arterial_hypertension_classification.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/42443196991.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/41078170744.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_off000062f0.bin
afc198d05d529c8cdc8aaf8a9b0fee3d422caa8af5eefb1b21c3ac27e2c90940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 5132 bytes
font_01_sfnt_off00007453.bin
77e1870f8298158db0c06d5a5d1ce7e6fe7209b73431f3736bc91bdebe45d992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7453 12964 bytes

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